MSD-GB-21C2-A-R
Type : Motorized Smoke Damper
Leakage Rating : Class -II
Blade Type : 3V Single Skin; A : Parallel Operation
Construction : Galvanized Steel (GI)
MSD B-21 Series is a high performance UL 555S Classified smoke damper with Class-III leakage rating, installed vertically or horizontally (with blades running horizontally) and is rated for airflow and leakage in either direction.
Data
UL- 555S Test Ratings
Leakage Rating : Class – II
Max Velocity : 2000 fpm
Max Operating Pressure: 4 in. w.g (1000 pa)
Operating Temperature : 250°F (121°C) for ½ hr- Class-II
350°F (176°C) for ½ hr – Class-III
Standard Construction
Frame
16 gauge (1.4 mm – 1.7 mm) thick galvanized steel
Blade
Parallel operated 3 ‘V’ type blade made of 16 gauge (1.4 mm – 1.7 mm) thick galvanized steel.
Blade Seals
Silicon rubber blade seals
Jamb Seals
Stainless steel.
Jack Shaft
12 mm diameter Galvanized steel shaft
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.
Optional Fittings
Retaining Angles
1½” x 1½” x 16 gauge (40 x 40 x 1.5 mm).
Thermal Response Device (TRD)
165°F (74°C).
Indicator
Externally mounted open, close visible Indicator.
Push Button
For manual reset of damper
Transitions (R)
Neck adapter for round duct connections.
Junction Box
Smoke Detector
Model : MSD-GB-21C2-A/R UL 555S 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
FO : Fail Open in the event of Fire
* The temperature ratings are for Honeywell 20 Nm actuators
with thermal enclosures.
Optional Construction (UL Certification N/A)
Frame : Stainless Steel 16 gauge (304/316L)
Blade : Stainless Steel 16 gauge (304/316L)
