The Chain Drive Rail Extension Kit for 10'-High The Chain Drive Rail Extension Kit for 10'-High Garage Doors is required for reliable everyday operation of Chamberlain chain drive models in 10-ft. garage door applications. Featuring a quick-install extension rail and replacement chain the kit includes everything needed for quick and easy installation. Includes one-year warranty rail extension replacement ...  More + Product Details Close

Cycle lifetime unchanged by diameter-versus-length tradeoffs: Since the material stress (and thus cycle lifetime) for equal torques varies only with d, and not D or N, trading coil diameter (D) for spring length (N) in this fashion has no effect on cycle lifetime. Long and skinny, versus shorter and fatter, they'll wear the same if they have the same wire size and diameter-length product. The game of life is all about wire size when it comes to springs (see below).


Given the complexity of a garage door and opener system, there are a variety of different areas something could go wrong. If your garage door shakes or is very loud during operation, the garage door closes all the way only to immediately open back up, the garage door opens slowly or closes too quickly, or the garage door opener and remote aren't working at all, you should seek help from a professional garage door repair specialist.


When a garage door goes off the track, the spring breaks, the door is dented or the garage door opener is on the fritz, a professional garage door repair specialist can help. The cost to have a garage door fixed varies, but the national average cost of garage door repair is $70-$110. The extent of the damage and the size and material of the door will affect the final cost. A garage door repair company generally charges a national average of $80 for a service call, which includes the first hour of labor and service, such as testing and inspecting the garage door and opener. Apart from labor, the garage door repair costs hinge on buying replacements parts. For example, a new spring costs an average of $60. Expect to pay several hundred dollars, though, if the door is beyond repair; a new garage door ranges in price from $200 to $4,000, and most homeowners spend an average of $800-$1,200.
With over 300 independently moving parts, your garage door is a deceptively complex piece of equipment. To help prevent malfunctions and break-downs, it is a good idea to occasionally perform a garage door tune-up to keep all of these parts in good working order. A regular tune-up service by a Sears professional can prevent unexpected door problems and prolong the life of your existing equipment.

The standard winding tools are simply a pair of 18-inch lengths of mild steel rod, 1/2-inch diameter. Winding cones can have different socket sizes (such as 5/8 inch instead of 1/2 inch), so it is important to measure the socket and select a matching rod diameter. Also beware that poor-quality cones may have a sloppy fit to the winding bars, and a loose fit presents a severe hazard of slipping at the worst moment; anything more than about an inch or two of play at the handle end is too loose for safety. I bought a 3-foot length of zinc-plated 1/2-inch diameter steel rod from Home Depot for about $3, which conveniently cuts into two halves of just the right length (the store might even cut it for you if you ask). A steel supplier selling at commodity prices might charge about 50 cents or so for such a piece that weighs about 2 lbs. Drill rod would work if used in the annealed condition in which it is originally sold, but the added expense provides no benefit and the brittleness (if it had been hardened and not annealed) would worry me a bit. Rebar, threaded rod, screwdrivers, etc., are absolutely foolish as they will not fit the socket snugly. Aluminum rod is definitely too weak, and will bend under the torque that must be applied. Longer rods would make for more leverage but unwieldly swing; shorter rods make for uncontrollable swing. As we'll calculate below, the 18-inch standard tool length is an appropriate compromise. Note that you do not need 18 inches of ceiling clearance above the torsion shaft to use an 18-inch rod, since you need not swing the rods above horizontal when winding.
When it comes to installing garage doors and openers, The Home Depot has an unbeatable team of professionals dedicated to making sure your garage door project runs smoothly from start to finish. Your new garage door can be customized with a variety of features like unique color choices, window styles and hardware upgrades. We also offer options for your garage door opener including Smartphone control, Wi-Fi, battery back-up. The Home Depot installs garage doors and garage door openers with extended warranties that go beyond industry standards. Contact us today for a free in-home consultation.
If you've researched this subject at all, you will no doubt have heard that you shouldn't be attempting torsion spring replacement as a do-it-yourselfer. That is generally good advice, so if you have any doubts about your abilities to do risky physical work on your own, hire the job out like everyone else. I found I was capable of doing this work with acceptable risk, because I intelligently understood the techniques, paid careful attention to methods and safety, knew how to use common tools in good condition, properly improvised the special tools I didn't have, and diligently attended to correctly performing a few moments of hazardous manipulation. I learned to do it purely on my own based mostly on bits of advice reluctantly given in Internet forums such as the Usenet newsgroup alt.home.repair. When I first wrote this page in 2002, there was no other do-it-yourself information available on the Web, and it was not until 2005 that reliable information disclosing the techniques started to appear elsewhere (see links below).
We believe we should treasure our natural resources, and our business practices reflect this ideal. All our service vehicles are flex-fuel efficient hybrids. When we have to throw away old parts, we recycle as many parts as possible. We clean up our trash after we complete a project. Our dispatch center is conscious about our carbon footprint and we use GPS technology and strategic planning to reduce our miles on the road.

A standard residential door raises 7.5 feet, but since the door goes horizontal this is equivalent to raising the whole door for half that distance, or about 3.75 feet. So if the door weighs, say, 150 lbs, then the energy supplied by the springs is 3.75 * 150, or about 563 foot-pounds. This is like throwing a 50-lb sack of cement up a 11-foot flight of stairs. Or catching a 50-lb sack of cement dropped from 11 feet up.


Center and level the first section after you install the brackets. The door must be level even if the floor isn’t, so use shims under the section to level it. The rubber gasket on the bottom section will fill the gaps created by an unlevel floor. To hold the level in place, tape it to the section. To hold the section in place, lightly toenail a 16d nail into the frame and bend it over the section. Add brackets and rollers before setting them in place and stack one section on top of another, toenailing as you go up.
It works well. Setup was straightforward. I had a hiccup, but it was because I inadvertently pulled the disable lever/chord and thought I’d ruined the opener. Flipped the lever and it works perfectly from the app and existing wall button/remote. 2-3 second delay in showing open/close when you use the wall/remote. Beeping and flashing lights for 5 seconds before closing (for safety).

To install a single new garage door it should cost between $500 and $800. They demonstrate that the average homeowner can usually tackle such a project in a nine hour time span and a professional will be able to complete it in roughly five hours. Should it be a DIY project? Not really, most housing experts point out that it is a two-person job, requires advanced carpentry skills, and even knowledge of household electronic systems.
We offer industry leading service performed by the best licensed professionals in the region. Whether you need springs replaced, a motor repaired or need a new panel on your door, our service workers will get the job done efficiently and effectively, ensuring that your door is back in working order as soon as possible. We also offer a wonderful preventative maintenance program. This is a cost effective way to ensure that you avoid future problems by having the small, unnoticed issues addressed right away.
As a first time homeowner, Home advisors is an invaluable tool! There is a steep learning curve that comes with buying a house!!!! Being able to have access to unbiased information is great! It really helps to have a basic idea of what costs are, and all the different things that go into each project. who knew that there was so much to consider when looking to replace garage doors!!!!

At this point I weighed the unlifted door to confirm and fine-tune my calculations. This is not strictly necessary, but it makes the adjustments easier to perform, if you happen to have a scale with the requisite capacity. With some helpers, we first lifted the door a few inches and rested it on blocks of wood to provide clearance underneath. Then I slid a 400-pound-capacity freight scale under the center of the door, we lifted again to remove the blocks, and lowered the door gently onto the scale. This door weighed in at 238 pounds, which is very heavy for a single-car door. Since the outside of the door carries the 3/4-inch plywood paneling to match the house, and that plywood weighs about 2 lbs/sq-ft, I estimate the door weight to be about 7 x 10 x 2 = 140 lbs of paneling with the rest 238 - 140 = 98 lbs the interior panels, hardware, and cobwebs. Knowing this total weight will help later in adjusting the torsion on the springs. After weighing, we removed the scale and blocks, leaving the door fully lowered again. Had I not had a high-capacity freight scale, I might have improvised a crude weighing device from levers and smaller weights of known mass, or a lever arm pressing a reduced proportion of the full weight onto a lower-capacity scale. Another factor to remember is that The weight of a wood door can vary with humidity.


We specialize in all varieties of garage door repair work. We have the tools and knowledge to get the job done safely. It can be somewhat dangerous to take on a garage door repair on your own, and most garage door companies will advise against attempting a DIY fix. There are some hazards to watch out for when working around these heavy and high tension doors. We recommend you give the experts at Girard's a call to address the issue in a safe and timely manner.

The garage door is the gateway to your home. By choosing an Overhead Door™ residential garage door, you are doing more than making a home improvement investment. You are making us a part of your daily life and relying on us for safety, security and dependable operation. Indulge your sense of design with a garage door that sets your home apart with style, appearance, safety and comfort. With dozens of garage door models to choose from, the Overhead Door™ brand provides style and design options to fit every home. ​


If return on investment is a priority and you don’t live in the West, your best strategy may be to buy a low- to moderately-priced door that significantly improves the look of your home. Consider adding an automatic garage door opener at the same time. The beauty of a new door and the convenience of an automatic opener are sure to be a winning combination.
What is a battery backup? During a power outage, a battery backup allows your garage door opener to keep working. This is especially important when a wildfire is blazing. During the infamous California wildfires, many people were getting trapped in their garages. Several even died. California state Senator Bill Dodd was among those unable to get out, since he could not manually open his heavy wooden garage door. Drawing on his personal experience, Senator Dodd introduced a bill to make battery backups mandatory in the state of California. On August 16, 2018 the Garage Door Safety Bill passed with wide bipartisan support. As Cheryl Diehm, a Santa Rosa resident who testified before lawmakers, put it, "Make no mistake -- this legislation will help save lives."
Garage doors break on their own schedule which is why we offer 24/7 Same Day Garage Door Repair. Emergency Service is also available upon request 7 Days a week. Say Goodbye to return trips because our expert Technicians Service Major Brands and are Equipped with Fully Stocked Trucks. When the garage door breaks, J&S Overhead Garage Door Service is your local Garage Door Repair Specialist. Whether your garage door or opener is not working our expert technicians will repair or replace any garage door system on the spot. Proudly serving Hampton Roads including Virginia Beach, Newport News, Chesapeake, Hampton, Yorktown, Suffolk, Portsmouth, Poquoson, Norfolk, Gloucester, Smithfield, Franklin, and Williamsburg, Virginia.
The Certified Technician, Rey Lopez, was competent, professional, polite, and willing to work. He quickly removed the old door and installed the new one. He then explained the vast differences between what we originally had and what we'd just purchased (stronger spring/tension rates; increased viability of door opening/closing life; beefier hardware; plastic vs. nylon rollers; stronger door reinforcement). Ray performed with alacrity his tasks and then demonstrated the quiet, solid way the door retracted--no banging after the initial rise from the ground. Finally, his attention to detail was so precise that he enabled another remote controlling all three doors, plus he capped some frayed wires, thus solving the problem of why the door opened intermittently. I would rate him a "6" on a scale of "1-5", meaning he went above and beyond our expectations. His "can do" attitude, coupled with the deference he showed, will take him a long, long way. May HaShem richly bless him in his endeavors!read more
This work is risky, but the risk is comparable to doing your own car repairs, or climbing on the roof of your house to clean your gutters. These are dangerous things that many people can do safely, but that safety depends on intelligent understanding and application of proper techniques. Professional door repair technicians, who are fully knowledgable, skilled, and experienced, report that they nevertheless are injured from time to time, despite their best efforts. Coldly evaluate your abilities and motivations, to judge whether you can manage the risks of this work for the benefit of the money and time you might save.
It's a great idea to hire a professional to do your garage door opener installation for a few reasons. First of all, a pro can often be the most time-efficient way to handle the garage door opener installation, because a pro will have the right tools and experience to make your garage door opener installation as swift and smooth as possible. Secondly, a pro garage door opener installation will include making sure all the required garage door opener mounts and sensors are put together properly. A great garage door opener installation will include using the manufacturer’s recommended method of assembly and optimal placement of the garage door opener mount and sensors. Find top-notch garage door opener installation pros on Amazon Home Services and you'll see professional garage door opener installation services at competitive prices. Secure convenience and peace of mind by getting a professional garage door opener installation for your home. You'll never regret adding a garage door opener installation project to your to-do list. If you’re the kind of person who doesn’t have the time or patience to do your garage door opener installation, don’t worry. Because you don’t have to if you don’t want to. Amazon Home Services has you covered, to do your garage door opener installation quickly and professionally. Just schedule the garage door opener installation pro of your choice from our list of top-rated service providers.
We specialize in all varieties of garage door repair work. We have the tools and knowledge to get the job done safely. It can be somewhat dangerous to take on a garage door repair on your own, and most garage door companies will advise against attempting a DIY fix. There are some hazards to watch out for when working around these heavy and high tension doors. We recommend you give the experts at Girard's a call to address the issue in a safe and timely manner.

Recently another type of opener, known as the jackshaft opener, has become more popular. This style of opener was used frequently on commercial doors but in recent years has been adapted for residential use. This style of opener consists of a motor that attaches to the side of the torsion rod and moves the door up and down by simply spinning the rod. These openers need a few extra components to function safely for residential use. These include a cable tension monitor, to detect when a cable is broken, and a separate locking mechanism to lock the door when it is fully closed. These have the advantage that they free up ceiling space that an ordinary opener and rail would occupy. These also have the disadvantage that the door must have a torsion rod to attach the motor to.
Call Girard's Garage Door Service, and one of our technicians will walk you through all the options to find the perfect garage door for your taste and budget. We work with the top manufacturers across the country to ensure the utmost safety and security for your family. We’re a volume dealer, so we’re able to beat the prices that most local companies charge. We offer excellent service at an affordable price. Check out our garage door options here.

I was careful not to assume that the previous installation correctly oriented the right- and left-hand springs on the correct sides of the center bearing plate. They could have been installed backwards by an incompetent installer, resulting in them having been wound looser (larger diameter coil) instead of tighter (smaller diameter coil) than when in their relaxed state, and if so I would have corrected them on the new installation. The proper orientation of the springs applies their reaction torque from tighter winding such that it turns the drums to lift the door. Verifying this is a rather simple exercise in mechanical visualization, but does require some care to be certain of correctness. If you were to install the springs backwards, and then start to wind them in the wrong direction, then the torsion bar will start winding the drums backwards, and not holding against the vise pliers, which should be obvious to inspection. Winding a spring backwards also tends to screw the spring off the cones; this error cannot proceed too far before the spring slips off the cones.
Today's garage doors come with those door sensors, and if anything is in the path of the door the sensor detects it and raises the door back to the open position. These precautions are important for families with young children or pets. Even if you don't have a mini me or furry friend running around your yard, it's a good idea to have a garage door that is safe for you, your guests and your belongings. 
Lift cable placement: On the standard residential door mechanism, the loops at the lower ends of the two lift cables loop over the two bottom roller shafts which project from the bottom bracket on the door. The upper cable ends fasten to the drums using one of the methods described above. The drums are positioned along the torsion shaft such that the inner edge of each drum is approximately over the edge of the door. The cable winds onto the drum from outside in, so at the top of travel the cable is winding onto the inner edge of the drum, vertical from the edge of the door where it is looped over the roller shaft. As the door is lowered, the cable winds out to the outer edge of the drum, and thus is a bit out from the vertical, but the cable still falls in the gap between the guide rails and door edge. My cables rub and slap on the rails a bit, but after 30 years and many 10,000s of cycles, they don't seem to have worn at all.
If this manipulative, we-are-your-nanny business approach is truly in our best interests as consumers, then we shouldn't be allowed near ladders, lawn mowers, or power tools. Those products are just as hazardous and prone to misuse as torsion springs, yet no one thinks of them as forbidden. The only genuine difference is that torsion springs are a hazardous thing you need only rarely, while a lawn mower is a hazardous thing you need all the time.
If your door feels heavy, it is likely that your springs have started to wear down and are no longer capable of bearing the weight that they once did. Now, don’t worry, just because a spring is starting to lose its strength doesn’t mean it will snap at any moment. However, simultaneously, a weak spring isn’t any safer to try and repair on your own.
Most garage door openers are pretty expensive. So if you need an opener on a budget, the Genie 1035-V (also known as the Genie Chain Drive 500) gives you that desirable low price point. It doesn't have a lot of high-end tech features, nor will it manage heavy garage doors, but it does the basic work of raising and lowering the garage door perfectly well.
With garage door installation costs, these numbers also include the actual purchase of the new door and other hardware, including the tracks, adhesives, connectors and fasteners. Keep in mind that if these numbers seem extreme, garage door replacement and upgrades can yield, on average, one of the highest returns on investments for homeowners — with an expected 85 percent.
Before purchasing a roll-up door, measure the space between the top of the garage door opening and the ceiling or overhead framing. Standard tracks require headroom of about 14 inches. If you don’t have that, you can get low-headroom track, which costs about $100 more. There are also tracks specially made for garages with unusually high walls or cathedral ceilings.

Repair Sagging Garage Doors – As doors and homes age, they can shift and move and sometimes this results in a garage door that needs to be realigned or reinforced. We will send a technician to your home to adjust the doors and to inspect the entire opening to make sure the door isn’t damaged. Once we understand the problem, we will fix the needed parts and make any adjustments to the door.
J&S Overhead Garage Door Service also specializes in garage door opener repairs including broken gears, safety sensors, garage opener and chain adjustments and even remote and keypad replacements. Our technicians service major brands and carry necessary parts ad equipment parts on the trucks so you will never have to wait for a repair. If your opener can’t be repaired we do offer same day and same appointment professional installations offering several different garage door opener including chain and belt drive options.
Insist on having any old parts returned to you, and have that noted on the written order before work begins. An honest and competent technician will not object to this. The evidence will establish whether you really needed the parts or not, and you can consult another opinion if you have any doubts. This tends to deter the parts-upsell scam, and protects you even if you know nothing about what you're buying while under the pressure of making a costly decision. If the old parts mysteriously "disappear", then you have reason to be suspicious.
The Certified Technician, Rey Lopez, was competent, professional, polite, and willing to work. He quickly removed the old door and installed the new one. He then explained the vast differences between what we originally had and what we'd just purchased (stronger spring/tension rates; increased viability of door opening/closing life; beefier hardware; plastic vs. nylon rollers; stronger door reinforcement). Ray performed with alacrity his tasks and then demonstrated the quiet, solid way the door retracted--no banging after the initial rise from the ground. Finally, his attention to detail was so precise that he enabled another remote controlling all three doors, plus he capped some frayed wires, thus solving the problem of why the door opened intermittently. I would rate him a "6" on a scale of "1-5", meaning he went above and beyond our expectations. His "can do" attitude, coupled with the deference he showed, will take him a long, long way. May HaShem richly bless him in his endeavors!read more
The salesman-disguised-as-technician trick: In this trick, you arrange for a service call to your home, perhaps paying a small fee up-front, and a neatly uniformed man arrives in a very technical-looking truck, carrying an impressive tool kit. He carefully examines your door, perhaps using some impressive testing devices to lend weight to his expertise. He then condemns your door as not worth repairing, and tells you, to his sincere regret, that you must have a new one. In fact, this technician is not a technician, but a salesman who only sells, and does not repair, doors. Even if he doesn't sell you, he is doing well just collecting fees for service calls that are no more than sales visits. He doesn't actually have to ever fix anything, and he may not even be capable of doing so himself. He's an expert at selling, which genuine technicians are not. In the worst case, when you refuse to buy a whole new door, he might refuse to follow up with a visit from an actual technician, either outright, or only with an unacceptable delay ("we're too busy to get a guy out until next week", when your car is trapped). If you find yourself closing in on this situation, then politely invite him to leave, and try someone else. That is your right, and in fact the only power you have to bargain in such circumstances. At that point, he may offer to promptly bring in his competent colleague, who will turn up lacking charm and looking awful, but might actually do the work, possibly at a fair price. If so, you will have beaten a legal variation of the classic illegal bait-and-switch (see below). The switch was attempted, but not required, which makes this legal. This is a hazard of any direct-sales situation. Because it rarely appears in everyday retail sales, it can surprise the unwary.
First and foremost, a garage door, by design, contains springs designed to balance your door and make it easier to lift. Those springs are under incredible amounts of tension. If a spring breaks or is improperly released, it can cause incredible and potentially fatal injuries. Keep in mind, when working on a garage door spring, it is likely that your face and head will be close to it, meaning that your most sensitive area will be in the direct path of the released spring.
Insulation, which increases energy efficiency and can help to lower utility bills, is crucial when a garage door is attached to the home. In this case, doors with high R-values are preferred. This means it has insulation that can keep the heat in. The higher the R-value, the better insulated your garage will be against outside noise and cold and hot air.

The salesman-disguised-as-technician trick: In this trick, you arrange for a service call to your home, perhaps paying a small fee up-front, and a neatly uniformed man arrives in a very technical-looking truck, carrying an impressive tool kit. He carefully examines your door, perhaps using some impressive testing devices to lend weight to his expertise. He then condemns your door as not worth repairing, and tells you, to his sincere regret, that you must have a new one. In fact, this technician is not a technician, but a salesman who only sells, and does not repair, doors. Even if he doesn't sell you, he is doing well just collecting fees for service calls that are no more than sales visits. He doesn't actually have to ever fix anything, and he may not even be capable of doing so himself. He's an expert at selling, which genuine technicians are not. In the worst case, when you refuse to buy a whole new door, he might refuse to follow up with a visit from an actual technician, either outright, or only with an unacceptable delay ("we're too busy to get a guy out until next week", when your car is trapped). If you find yourself closing in on this situation, then politely invite him to leave, and try someone else. That is your right, and in fact the only power you have to bargain in such circumstances. At that point, he may offer to promptly bring in his competent colleague, who will turn up lacking charm and looking awful, but might actually do the work, possibly at a fair price. If so, you will have beaten a legal variation of the classic illegal bait-and-switch (see below). The switch was attempted, but not required, which makes this legal. This is a hazard of any direct-sales situation. Because it rarely appears in everyday retail sales, it can surprise the unwary.

Winding "up" starts out easy. It finishes at the proper number of turns, by which time you are pushing against the maximum torque. Count the turns of spring winding from when the springs are slack. To be sure you're winding the right direction, all you have to remember is that proper winding makes the spring smaller in diameter and longer in length as it twists "in". On the standard door (most common), this means you push the winding bars up to wind up the spring, which is an easily remembered rule. This is very apparent and should be verified during the first few easy turns. You can also think about the correct winding direction in mechanical terms, namely which way the reaction of the spring will torque the shaft and drums, which in turn will lift the cable. This should all make perfect sense before you attempt the manipulations.
Most importantly, you will be greeted by friendly staff and associates that will help you select the right garage door for your home. We welcome the opportunity to supply, install, and/or repair your garage door as well as answer any door questions you may have. When you choose us, you will quickly discover why thousands of Riverbend area customers from house to house and generation to generation have chosen Dan's Garage Door Service as their “DOOR KEEPER” for over 40 years.
Electric Garage Door Openers – Service and repair of the electric garage door opener itself, including the lift mechanism that pulls the door up and guides it down. This is typically not part of the garage door itself and is serviced and repaired on its own interval. Typical service includes inspection, repair, adjustment, and lubrication if needed. Also, we typically inspect the mounting of the unit as well as its attachment to the door itself.

Good customer service is important for any product, but it is especially important for the class of garage door openers we considered. We looked primarily at models designed to be installed by a homeowner, not a professional. Even if you consider yourself to be pretty handy, you are sure to have questions at some point along the way. As such, we looked for companies that respond to all inquiries as well as for resources, such as a downloadable manual, to help with installation.
With over 30 years experience, Delaware Express Garage Doors, LLC, takes pride in providing the best service and making sure you are 100% satisfied with our work. We specialize in Garage Door and Opener installation and repair. From simple garage door openers to cell phone enabled devices, our technicians will get your doors working safely with fast reliable service.
When your garage door starts acting up, more often than not it is telling you it's time to do a bit of maintenance. So, before hitting the panic button, try these simple repairs. First, examine the rollers and tracks. If you can't remember the last time you cleaned them (and they look the part!), give them a good brushing and then add some lubricant. Next, perform these simple garage door maintenance tasks.

For more than 35 years, AE Door & Window has served the Cincinnati and Northern Kentucky areas with high-quality Clopay garage door products and exceptional services. We started as a small company operating out of a garage. In the decades since we first opened, we’ve grown into a regional provider that businesses and homeowners turn to when they need garage door products, services and repairs.


The third stage of garage door opener technology uses a frequency spectrum range between 300-400 MHz and rolling code (code hopping) technology to defeat code grabbers. In addition to transmitting a unique identifier for the remote control, a sequence number and an encrypted message are also sent. Although an intruder could still capture the code used to open a garage door, the sequence number immediately expires, so retransmitting the code later would not open the garage door. The encryption makes it extremely difficult for an intruder to forge a message with the next sequence number that would open the door. Some rolling code systems are more involved than others. Because there is a high probability that someone will push the remote's button while not in range and thus advance the sequence number, the receiver does not insist the sequence number increase by exactly one; it will accept a sequence number that falls within a narrow window or two successive sequence numbers in a much wider window. Rolling code technology is also used on car remote controls and with some internet protocols for secure sites.
Mechanical garage door openers can pull or push a garage door with enough force to injure or kill people and pets if they become trapped. All modern openers are equipped with “force settings” that make the door reverse if it encounters too much resistance while closing or opening. Any garage door opener sold in the United States after 1992 requires safety eyes—sensors that prevent the door from closing if obstructed. Force settings should cause a door to stop or reverse on encountering more than approximately 20 lbs (9.07 kg) of resistance. Safety eyes should be installed a maximum of six inches above the ground. Many garage door injuries, and nearly all garage door related property damage, can be avoided by following these precautions.
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