Type : Motorized Fire Damper
Fire Rating : 21 Series-1½ hour
Blade Type : 3V Single Skin; A : Parallel Operation
MFD B-21 Series is a high performance UL 555 Classified fire damper with 1½hr.fire rating, installed vertically or horizontally (with blades running horizontally) and is and is rated for airflow in either direction.
Data
UL-555 Test Ratings
Fire Rating : 1½ hrs.
Standard Construction
Frame
16 gauge (1.4 mm – 1.7 mm) thick galvanized steel.
Blades
Parallel operated 3 ‘V’ type blade made of 16 gauge (1.4 mm – 1.7 mm) thick galvanized steel.
Jamb Seals
Stainless steel.
Jack Shaft
12 mm diameter Galvanized steel shaft.
Thermal Response Device (TRD)
165°F.
Actuator
Honeywell, Belimo, Seimens (24V AC, 120V AC, 230V AC).
Sleeve
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.
Bushes
Fire resistant bronze bush.
Limit Switches
For BMS open / close indication.
Optional Fittings
Retaining Angles
1½” x 1½” x 16 gauge (40 x 40 x 1.5 mm).
Blade Seals
Silicon rubber blade seals.
Indicator
Externally mounted open / close visible indicator.
Push Button
Manual reset for damper.
Transitions (R)
Neck adapter for round duct connections.
Junction Box
Model : MFD-GB-21-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)
Note :
FC : Fail Close in the event of Fire
Optional Construction (UL Certification N/A)
Frame : Stainless Steel 16 gauge (304/316L)
Blade : Stainless Steel 16 gauge (304/316L)
