Type : Motorized Fire Damper With Melting Fuse
Fire Rating : 20 Series-1½ hour
Blade Type : 3V Single Skin; A : Parallel Operation
Construction : Stainless Steel (SS)
MFD B-F-20 Series is a high performance UL 555 Classified fire damper with 1½hr. / 3hr. fire rating, installed horizontally (with blades running horizontally) and is rated for airflow in either direction.
Fire Rating : 1½ hrs
Max Velocity : 2000 fpm
Max Operating Pressure: 4 in. w.g (1000 pa)
16 gauge (1.4 mm – 1.7 mm) thick Stainless Steel.
Parallel operated 3 ‘V’ type blade made of 16 gauge (1.4 mm – 1.7 mm) thick Stainless Steel.
12 mm diameter Galvanized steel shaft.
Mild steel Spring ( 30lb).
Honeywell (24V AC, 120V AC, 230V AC).
Minimum 0.9 mm, single section is field or factory installed.
Multiple section is factory installed.
Sleeve thickness as per NFPA table 3-4.6.3.
For BMS open / close indication.
1½” x 1½” x 16 gauge (40 x 40 x 1.5 mm).
Silicon rubber blade seals.
Externally mounted open / close visible indicator.
For manual reset of damper.
Neck adapter for round duct connections.
Model : MMFD-SB-F-D-20-A/R UL 555 Damper meets the required standards of SMACNA,NFPA, IBC, BOCA, ICBO, UL.
Actuator location standard: Left side from rear view
(Jack shaft view)
FC : Fail Close in the event of Fire
Note : * Standard Fusible link temperature is 165°F
Above 165°F available upon customer request.