UL- 555 Test Ratings

Fire Rating : 1½ hrs.

Standard Construction

Frame

20 gauge (0.9 mm) thick stainless steel.

Blade

Curtain type blade made of 22 gauge (0.8 mm) thick stainless steel.

Fusible Link

165°F.

Blade Ramp

16 gauge (1.5 mm) thick stainless steel angle.

Spring

0.3 mm thick by 19 mm wide, stainless steel constant force spring

Mounting

Vertical

Optional Fittings

Sleeve

Minimum 0.7 mm, single section is field or factory installed.
Multiple section is factory installed.
Sleeve thickness as per NFPA table 3-4.6.3.

Retaining Angles

1½” x 1½” x 16 gauge (40 x 40 x 1.5) mm.

Limit Switches

For BMS open / close indication.

Transitions (R)

Neck adapter for round duct connections.

Model :FD-SB-22-A/B/AS/BS/R UL 555 Damper meets the required standards of SMACNA, NFPA, IBC, BOCA, ICBO, UL.