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