Cornell Cookson Rolling Doors in Maryland

CornellCookson makes custom rolling steel service doors, insulated rolling doors, fire rated doors, counter shutters and security grilles under two brands, Cornell and Cookson, at plants in Mountain Top, Pennsylvania and Goodyear, Arizona. ADP Garage Door Repair is an authorized Cornell Cookson dealer in Central Maryland. We install new Cornell Cookson doors and grilles for warehouses, storefronts, schools and other buildings, and we repair the ones already in place: we have replaced Cornell logic boards, barrels and other Cornell Cookson parts.

• 230+ commercial door jobs (all brands) completed since June 2020
• 80+ commercial door jobs (all brands) in the last 24 months
• ¾ to 4 hr UL fire protection ratings on Cornell rolling fire doors

Counts come from our own Housecall Pro job records and cover all of our commercial door work, not only Cornell Cookson doors. Product facts on this page are from CornellCookson’s websites (cornellcookson.com, cornelliron.com and cooksondoor.com), checked November 2026.

Who makes Cornell and Cookson doors

• Two brands, one company. Cornell traces its ironwork business to 1828 and has focused on rolling doors since the early 1900s; the Cookson Company was started in 1938. Both are now CornellCookson, sold through a network of more than 700 Cornell and Cookson dealers.
• Built to order. Cornell makes its rolling doors to the size of each opening, with standard construction up to 30 ft wide and 30 ft high, in galvanized steel, stainless steel or aluminum.
• Made for commercial use. You find these doors on loading docks, parking garages, hospitals, schools, pharmacies, cafeterias, stadiums and storefronts.

Cornell groups its doors by what the opening needs: everyday security, insulation, speed, fire protection or high wind. These are the lines and model names Cornell uses.

From Cornell’s product pages (cornelliron.com), checked November 2026. Sizes, gauges and finishes vary by model; we confirm them for your opening before ordering.

Product images: CornellCookson (cornelliron.com).

The biggest question is how many times a day the door opens. Cornell’s standard service door is built for up to 20 cycles a day. A busy dock or parking garage door that runs all day needs a high cycle or high performance door. Cornell compares the three in its own selection sheet:

From Cornell’s 2026 “Find the Right Door” comparison sheet (cornelliron.com), checked November 2026. All three need 20 inches of headroom and can have windows and insulation.

Other things to settle before you order

• Fire rated opening? If the door sits in a fire wall, it must be a listed fire door with the right hour rating, and it will need yearly drop tests (below).
• Heat and noise. Insulated Thermiser doors help with climate control and sound in heated warehouses and shops.
• View and airflow. A grille keeps a storefront visible after hours. ScreenGard™ perforated slats give a solid door some of the same airflow and visibility.
• Forklift traffic. Cornell offers a heavy duty bottom bar and a rolling door protector for openings that get hit.
• Color. SpectraShield™ powder coat comes in more than 180 colors, and Omni Powder Coat colors match select Clopay sectional doors.

A rolling door cannot use a regular garage door opener: Cornell says so plainly, because the curtain coils above the opening instead of running on ceiling tracks. Cornell doors open by push up, chain hoist, hand crank or a rolling door operator.

• Model MG: a medium duty gear head operator for doors that cycle no more than 20 times a day, with a maintenance free brake and overload protection. A splashproof version is available.
• Model SG: a super duty, full logic operator for larger doors. A waterproof stainless steel version is available.
• EverGard™: an operator with a self charging battery backup that runs the door 10 cycles over 48 hours without power.
• Tube motors: concealed motors for counter shutters, grilles and tight spaces.
• ControlGard™ chain hoist: Cornell’s manual chain hoist with a built in brake that holds the door unless someone pulls the chain.
• Fire door operators: AlarmGard®, AlarmGard Plus and the AlarmGard tubular motor close the door on an alarm signal and can reset without anyone on site; FireGard™ releases the door when heat melts its fusible links.
• APEX SmartController™: the control panel on Cornell’s high performance doors, with an LCD screen and plug and play wiring.

Operator won’t run? Checks from Cornell’s manual

From the maintenance schedule and operator troubleshooting table in Cornell’s rolling door installation manual, and Cornell’s operator pages (cornelliron.com), checked November 2026.

After any operator repair, test the safety devices the way the operator’s manual says: the sensing edge or photo eyes must stop and reverse the door when something is in its path.

Under NFPA 80, rolling fire doors must be inspected and drop tested at least once a year by a trained rolling steel fire door technician. Keep the acceptance test record for the life of the door and the yearly records for at least three years. Cornell notes that general maintenance staff cannot do this test unless they have that training.

What Cornell says a drop test includes:

1. Visual inspection of every part for damage, wear or anything in the way.
2. Automatic release from the fully open position, to confirm the door starts closing on its own.
3. Controlled descent: the closing speed is measured; it must be between 6 and 24 inches per second.
4. Complete closure: the door closes fully and rests on the floor or sill with no help.
5. Reset to normal operation. The test is often run twice to confirm the closing system resets correctly.

A door that fails must be repaired or replaced and pass a retest. The same yearly test applies to counter fire shutters and smoke and fire curtains. See our fire door drop testing service.

From Cornell’s guide “Your Complete Guide to Fire Door Drop Testing and NFPA 80 Compliance” (cornelliron.com), checked November 2026.

Cornell’s manual says not to run the door while any of these problems exist. What a facility manager can check:

• Weekly: damaged slats, endlocks or bottom bar; the door hanging up, jamming or making odd noises; locks that don’t hold; the curtain rubbing the hood; a door that takes too much force to open; a sensing edge that doesn’t work.
• Monthly: loose bottom bar, curtain, guide and wall fasteners; a torn bottom seal; noisy or binding bearings; bent guides or missing stoppers.
• Quarterly: brackets plumb and tight, drive chain lubricated and tight, hood level and not dented, operator mounting secure.

Cornell’s warranty

From Cornell’s FAQ, product pages and rolling door installation manual (cornelliron.com), checked November 2026.

Grilles, shutters and operators from our commercial jobs. Our records rarely name the door brand, so the counts at the top of this page cover all of our commercial door work.

Call us for a new Cornell Cookson rolling door, grille or counter shutter, or for repairs to the one you have: logic boards, barrels, springs, slats, bottom bars, guides and operators. We also do fire door drop testing, commercial spring repair and security shutters. Commercial work is quoted per project, and estimates are free: call, or text photos of the door and its label. We are open 24/7, you get a firm price before any work begins, and the $45 service call is waived when we do the repair. See commercial door installation, commercial door repair, roll up door services, our service area and all the brands we install.