RSG DH24120FB — DH Series electromagnetic fire door holder, flush mount, brass finish, dual 24 V and 120 V input.
A door holder keeps a fire-rated door open against its closer and releases it the moment the alarm removes power. The number reads off the manufacturer model-number syntax block: DH door holder, 24120 the dual 24 V and 120 V coil, F flush mount, B brass. A P before the finish letter marks a powdercoated unit, and this number has none.
- Dual voltage: 24 V to the C and L terminals, 120 V to the C and H terminals
- 20 mA at 24 VDC, 19 mA at 24 VAC, 20 mA at 120 VAC
- Holding force 40 lb (18.1 kg) at 24 VDC, 35 lb (15.8 kg) at 120 VAC
- 120 V on the low-voltage C and L terminals gives 110 lb (49.8 kg) at 20 mA
- Die-cast body; face plate 3-5/16 × 4-5/8 in. (84 × 117 mm)
- Data sheet carries UL, FM, CSFM and NYC BSA agency marks
The confusable parts are the other coil pairs in the same table: DH1224 for 12 V and 24 V, holding 30 lb at 40 mA, and DH24220 for 24 V and 220 V, holding 20 lb. Letters after the voltage change only the housing — S surface, G ground, R recessed, PC chrome.
