24" X 10" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Black 1/2" White insulation will give LO246 Product Details Size 32 Compatible with Duct 4"

1/2" White insulation will give you a good R value of 3

this flex duct decreases the pressure loss and provides a more hygienic environment

actual front end outer dimensions are approximately 16 5/8" width X 38 5/8" height

+ Product Details Size - 18"w X 12"h is the size for the duct opening measurement only

24" X 10" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIR FLOW LINEAR BAR GRILLES Black 1 2" White insulation will give LO246 Product Details Size 32 Compatible with Duct 4" 1 2" White insulation will give you a good R value of 3 this flex duct decreases the pressure loss and provides a more hygienic environment