UL- 555 Test Ratings

Fire Rating : 3 hrs.

Standard Construction

Frame

18 gauge (1.2 mm) thick galvanized steel.

Blade

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

Fusible Link

165°F (74°C).

Blade Ramp

16 gauge (1.5 mm) thick galvanized steel angle.

Spring

0.3 mm thick by 19 mm wide constant force spring formed from stainless steel.

Mounting

Vertical / Horizontal

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.

Optional Fittings

Retaining Angles

1½” x 1½” x 16 gauge (40x40x1.5 mm).

Limit Switches

For BMS open / close indication.

Transitions (R)

Neck adapter for round duct connections.

Model : FD-GB-31-A/AS/B/BS/R UL 555 Damper meets the required standards of SMACNA, NFPA, IBC, BOCA, ICBO, UL.