What are the types of commercial garage door openers?

Commercial garage door openers, which the trade calls operators, come in three main types. A trolley operator hangs from the ceiling and pulls a standard-lift sectional door along a rail. A jackshaft operator mounts on the wall beside the door and turns the door's spring shaft. A hoist operator mounts at the barrel of a rolling steel door and adds a hand chain for running the door without power. Some models combine the jackshaft and hoist designs, and heavy gearhead hoists handle the biggest doors. The right one depends on the door, how often it cycles, the room around the opening and how the door should close.

The main types at a glance

Type	Where it mounts and how it drives	Best fit	Running the door by hand
Trolley	On a rail over the center of the door. A chain pulls a trolley and door arm.	Standard-lift sectional doors with headroom and ceiling space behind the door	Quick disconnect on the door arm
Jackshaft	On the wall beside the door. A sprocket and chain turn the torsion shaft.	High-lift and vertical-lift sectional doors, and bays where the ceiling must stay clear	Floor-level disconnect
Hoist	Beside the barrel of a rolling door, driving it through a chain and sprocket.	Rolling steel doors, security grilles and counter shutters	Floor-level hand chain with an electrical interlock
Jackshaft-hoist	Beside the door, like a jackshaft.	Doors where both a disconnect and a hand chain are wanted	Both floor-level systems
Gearhead hoist	Beside the barrel, with a worm gear reducer running in an oil bath.	Large, heavy rolling doors that need more horsepower	Hand chain with an electrical interlock

The names above follow LiftMaster's Logic 5.0 commercial line (models T, GT and APT for trolley, J for jackshaft, H for hoist, HJ for jackshaft-hoist and GH for gearhead hoist). Other makers build the same types under their own model names.

Trolley operators

A trolley operator is the closest thing to a home garage door opener, built heavier. It sits on a rail over the middle of the door, and a chain moves a trolley that pushes and pulls the top section through a door arm. It needs headroom above the door and clear ceiling behind it for the rail, so it suits standard-lift sectional doors in shops, fire stations, auto bays and similar buildings.

LiftMaster's manual rates its standard trolley (model T) for about 25 cycles an hour and 80 to 90 a day. Its gear-reduced trolley (GT) is rated for 25 an hour and over 90 a day, and its apartment and condo trolley (APT) is listed for applications that need over 100 cycles a day. A brake comes standard on the larger trolley models.

Jackshaft operators

A jackshaft operator mounts on the wall at one side of the door and drives the door's torsion shaft through a sprocket and chain. Nothing hangs from the ceiling, which is why it is the usual choice for high-lift and vertical-lift sectional doors, where a trolley rail would be in the way, and for bays with cranes, lights or racking overhead. It needs side room on the operator side and a door whose springs and cables are in good order, because LiftMaster warns that cable tension has to hold through the whole travel of a sectional door run this way. Our guide to the commercial jackshaft operator covers locking and security.

Hoist and gearhead operators

A hoist operator is the standard choice for rolling steel doors, rolling grilles and counter shutters. It mounts beside the door's barrel or bracket and turns the barrel through a chain and sprocket. A hand chain hangs to the floor, and when someone engages it an electrical interlock shuts off the controls so the motor cannot fight the person on the chain.

A gearhead hoist uses a worm gear reducer in an oil bath instead of a belt and chain reduction. LiftMaster builds its gearhead models in more horsepower ratings, with a brake on every one, for the larger and heavier rolling doors on warehouses and freight docks. The manual's door size tables step up with horsepower and step down for heavier steel and insulated doors, so the operator is matched to the door, not to the opening alone.

Safety modes and UL 325

How a commercial door closes is a safety choice as much as a convenience. Under UL 325, commercial door operators made on or after August 29, 2010 must either use constant pressure to close, where someone holds the close button until the door is down, or be fitted with a primary external entrapment protection device that the operator monitors, such as photo eyes or a sensing edge on the bottom bar.

That is why operators offer several wiring modes. LiftMaster's Logic 5.0 ships set to a hold-to-close mode, and its manual says a monitored entrapment protection device is required before the operator can be set to the modes where one press closes the door or a timer closes it. DASMA's technical data sheet on edge sensors says to check and test the device for proper operation monthly and to repair or replace a damaged one. Our page on commercial garage door safety requirements goes further.

How to choose the right type

1. Start with the door. A rolling steel door, grille or shutter takes a hoist or gearhead operator. A sectional door takes a trolley or a jackshaft.
2. Look at the room around the opening. A trolley needs headroom and ceiling space behind the door. A jackshaft or hoist needs side room on the operator side and a solid wall to mount on.
3. Count the cycles. A door that opens a few times a day and a dock door that runs all shift need different duty ratings. Ask how many cycles an hour and a day the operator is rated for.
4. Match the horsepower to the door. A larger, heavier or insulated door needs more horsepower. The maker's door area tables, not the opening size alone, decide it.
5. Check the power. Commercial operators come in single-phase and three-phase versions, and the Logic 5.0 lets the installer select the voltage within a phase, from 115 up to 575 volts.
6. Decide how the door should close. If staff want one-press or timer closing, plan on monitored photo eyes or a monitored edge from the start.
7. Plan for outages. On a rolling door, the hand chain is the way to move the door when the power is out. Make sure everyone who opens the building knows where it is.

A residential opener on a commercial door is a common mistake on small buildings. See commercial vs residential garage door openers for why duty cycle matters.

Common questions

Are all commercial garage door openers the same?

No. The drive type, duty rating, horsepower, voltage and safety mode all differ, and an operator that suits a standard-lift sectional door can be wrong for a rolling steel door or a high-lift door on the same building.

What horsepower does a warehouse door opener need?

It depends on the door's size, type and weight. A light rolling door may run on a fractional horsepower hoist, while a large insulated door can need a gearhead operator of several horsepower. The technician reads the door and the maker's tables before choosing.

Which brand is best for a commercial door?

The major makers all build full commercial lines. The type and duty rating matter more than the badge, along with whether someone local can service the operator and get parts for it. We work on every brand, so we can service whatever is already on your building.

How often should a commercial operator's safety devices be tested?

DASMA's edge sensor data sheet calls for checking and testing the device monthly, and the operator maker's manual sets the tests for photo eyes. A commercial maintenance visit is a good time to test the operator, the photo eyes, the edge and the door balance together.

How G Brothers helps

G Brothers installs and services every brand and every operator type, including jackshaft, trolley, hoist and gate operators, and standardizes on none, which suits buildings that inherited whatever equipment was already there. Our records show 57 commercial operator jobs, 12 of them installed together with a new door. We dispatch 24/7 when a door is down and can send a certificate of insurance, usually within 24 hours. See commercial garage door operators for repair and replacement, or commercial garage door repair when the door itself is the problem. Call (720) 421-6489 or contact us to have your door and operator looked at in Denver, Lakewood or anywhere in the metro.

Sources

• LiftMaster, Logic 5.0 Commercial Door Operator Installation Manual (models T, APT, H, J, HJ, GH and GT)
• DASMA, New UL 325 Requirements for Commercial Door Operators
• DASMA, TDS 368: Edge Sensors