MFD-SB-20-A-R

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 Stainless Steel.

Jamb Seals

Stainless steel.

Jack Shaft

½” x ½“ (12 mm) Galvanized steel square shaft.

Thermal Response Device (TRD)

165°F.

Actuator

Honeywell (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-SB-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)

Note :
FC : Fail Close in the event of Fire