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Pottorff > Ceiling Radiation Dampers > Ceiling Radiation Dampers > Wood Truss Systems > CFD-521-BT

Model CFD-521-BT

1 Hour - Ceiling Radiation Damper
R-6.3 Insulated Outlet Box - Butterfly Style Blade

The CFD-521-BT ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The CFD-521-BT is installed horizontally in the ceiling membrane of combustible and non-combustible assemblies with fire resistance ratings up to and including 1 hour.

CFD-521-BT R-6.3 Insulated Outlet Box - Butterfly Style Blade

Standard Construction

Frame: 30 ga. (0.40) galvanized steel outlet box with 1-1/2" (38) thick fiberglass R-6.3 insulation.

Blades: 22 ga. (0.85) galvanized steel - butterfly.

Plaster Ground: 5/8" (16) deep x 1" (25) wide.

Fire Closure Device: Fusible Link.

Fire Closure Temperature: 165oF (75oC).

Minimum Size: Grille Opening - 4" x 4" (102 x 102), Duct - 4" Ø (102 Ø)

Maximum Size:
Grille Opening - Square: 12" x 12" (305 x 305)
Rectangular: 24" (610) W or 24" (610) H with a maximum area of 144 in2. (929 cm2)
Duct - 10"Ø (254 Ø)                              



UL 555C Fire Resistance Rating: 1 hour (horizontal, for use in UL assemblies L-521, L-528, L-546, L-574, L-576, L-581, L-583, L-585, M-509, M-540 and in roof/ceiling designs P-522, P-545, P-579 and P-580).

Thermal Resistance: R-6.3 or 8.0

UL 555C Listing: R14603

CSFM Listing: 3226-0368:104

Warnock Hersey Listing #: WHI-495-PSH-0177, -0178

Meets NFPA Standards: 90A and 101

Meets Building Code Standards: IBC, NBC, NFPA, SBC and UBC

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