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-544, and P-547 (similar design applications*: L-521, L-550, L-586, and P-522).
1" perimeter flange provided for boot clip or angle installation.
Opening 1/4" oversized to accommodate register/grille.
Approved for use with steel and aluminum grilles/registers.
Special sizes available upon request.
Plaster ground extension available in 1", 1-1/2", and 2".
Insulation: available in R-6 or R-8.
California residents: see Proposition 65 Warning
Weight 2.5 Pounds (Lb) Width 10.75 Inches (In) Height 9.25 Inches (In) Country of Origin USA Length 6.75 Inches (In) Brand Miami Tech R-Value R6 Flanged Yes Galvanized Yes Adjustable No Color Brown Composition Steel, Fiberglass Features UL FIRE-RATED Finish Yes Gauge 22 - 28 GA Insulated Yes Size 8" x 4"