12" x 6" x 7" R-6 CRD UL-RATED CEILING RADIATION DAMPER BOX

UL File No.:R10967
Designed to function as a heat barrier in air handler openings in fire resistant membrane ceilings.
UL-listed fusible link (165 degree fahrenheit standard).
UL approved for use in design types: L-528, L-546, L-558, L-562, L-563, L-585, M-516, P-533, P-544, and P-547 (similar design applications*: L-521, L-550, L-586, and P-522).
Opening 1/4" oversized to accommodate register/grille.
1" perimeter flange provided for boot clip or angle installation.
Approved for use with steel and aluminum grilles/registers.
Plaster ground extension available in 1", 1-1/2", and 2".
Special sizes available upon request.
Insulation available in R-6 or R-8.