The visible "door": steel slats, hooked together, that make one continuous curtain. Each slat hooks into the one above it. Each slat has an end piece at each end.
A steel pipe at the top of the opening that the curtain coils around. Brackets hold the barrel on each side, and a hood covers it.
Vertical steel channels on each side of the opening that the curtain rides in. They keep the curtain lined up with the opening.
The steel bar along the bottom of the curtain. It carries the astragal, the seal that meets the floor.
A sheet metal cover over the barrel and the coiled curtain.
The counterbalance spring helps the curtain move. Ask the door's maker for its cycle rating. Spring work is a job for a trained door technician, not a do-it-yourself fix.
A sketch of the idea, not measured data.
| Door type | Where the door goes when open |
|---|---|
| Rolling steel | Coils onto the barrel above the opening, under the hood |
| Sectional | Travels up and back along tracks under the ceiling |
A rolling service door at a warehouse or loading dock opening.
DASMA's data sheet TDS 258 says the fire code (NFPA 80) requires an automatic closing device on every rolling steel fire door, that the door has to close on its own when a fusible link or detector is set off or released, and that a governor, where one is fitted, controls how fast the curtain comes down.
An open-pattern curtain of steel rods joined by links.
Small rolling doors for service windows and counters.
Roll-up doors on self-storage units.
DASMA's FAQ data sheet TDS 295 says a rolling steel fire door that is kept as a door has to be maintained as a working door, including an inspection and drop test every year under NFPA 80, done by a trained door systems technician. The building owner is responsible for that upkeep. If you own one, ask a qualified fire door inspector what your door needs.