Rixson FM900-75 — 3/4 inch spacer for the FM Series electromagnetic door holders, listed by Fire-Lite (Honeywell) in data sheet DF-51410.
FM Series holders anchor to the wall or floor behind a fire or smoke barrier door and release it when the panel drops power. Where trim, a baseboard or a thick wall finish leaves the magnet face short of the armature plate, the two faces cannot meet flat and holding power suffers. This spacer shims the electromagnet out to close that gap.
- Spacer, 3/4 in. (1.905 cm), per Fire-Lite data sheet DF-51410
- Accessory for the FM980 floor-mount, FM996 surface wall-mount and FM998 flush wall-mount holders
- Companion sizes: FM900-50 (1/2 in.) and FM900-100 (1 in.)
- Larger offsets and odd angles use the FM900 or FM900-Z 90° extension kits instead
Measure the shortfall first, as the thickness is fixed. Door hardware and trim projections must stay compatible with the total projection of the release, so re-check clearance after shimming.
