Assembled Product Length: 12" Assembled Product Height: 2" Assembled Product Width: 48" . Insulation Blanket This insulation is designed for use with the Attic Insulation Shield (CF-AIS), Wall Thimble (CF-IWL) and Cathedral Ceiling Support (CF-CCSK) Can be used with 1" and 2" chimney pipe Designed to wrap around chimney Hi-temp mineral-fibre insulation Protects building materials against radiant heat from chimney Stops cold-air infiltration into dwelling 48" wide x 12" high x 2" thick