Improve your heating， ventilation and air conditioning duct system by installing this Master Flow 15 in. x 13 in. Ductboard Triangular Terminal Box - R-6 that features an insulated fiberglass design. Insulated ductboard for improved temperature regulation. Product is \"knocked down\" for shipping and must be assembled.
Fiberglass material for durability
Insulated ductboard for improved temperature regulation
Minimum temperature rating of -25°F
Ductboard boxes help to eliminate system noise， have a high thermal efficiency， and when properly sealed with mastic， result in less air leakage
Always seal seams with code approved mastic or sealant (or duct tape)， not included
Pre-cut for easy assembly using approved foil tape
R6 insulating value results in higher thermal efficiency for ductboard products
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