Constructed of 4-ply aluminum foil laminate. Flexible. Ideal for gas and electric clothes dryer installations. Fire-resistant, will not support combustion. UL 2158A listed and marked. No. BTD45: Dimensions: 4 In. x 5 Ft., Material: Aluminum, Type: Flexible, Pkg Qty: 1 No. BTD48: Dimensions: 4 In. x 8 Ft., Material: Aluminum, Type: Flexible, Pkg Qty: 1 No. BTD48TC: Dimensions: 4 In. x 8 Ft., Material: Aluminum, Type: Flexible, Pkg Qty: 1
