18" X 14" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w30h30 Think of the diameter as Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Think of the diameter as a straight line from one end to the other

+ Product Details Size - 28"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 17 3/4" x 1"

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height -

+ Product Details Size - 25"w X 25"h is the size for the duct opening measurement only

18" X 14" ADJUSTABLE AIR SUPPLY DIFFUSER HVAC Vent Duct Cover Sidewall or Ceiling w30h30 Think of the diameter as Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Think of the diameter as a straight line from one end to the other + Product Details Size 28"w X 18"h is the size for the duct opening measurement only