28"W X 6"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 29.75"W X 7.75"H] Ceiling + Product Details Size - Ducting Components RG2016 FBA-HP Applications The C box

+ Product Details Size - 25"w X 6"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 22 5/8" height

+ Product Details Size - 25"w X 8"h is the size for the duct opening measurement only

75" width X 7

of up to 300m3/h

28"W X 6"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 29.75"W X 7.75"H] Ceiling + Product Details Size Ducting Components RG2016 FBA HP Applications The C box + Product Details Size 25"w X 6"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 22 5 8" width X 22 5 8" height