24" X 48" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Width_12in + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 10" or 10" x 12" duct opening (measured at the opening)

And is classified as Class 1 Fire Proof - B1

+ How To Measure a Grille Before You Buy Duct Opening Size:

Equipped with a lever for easy airflow adjustment and dampening

actual front end outer dimensions are 7" width X 7" height

24" X 48" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIR FLOW LINEAR BAR GRILLES Width_12in + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 12" x 10" or 10" x 12" duct opening (measured at the opening) And is classified as Class 1 Fire Proof B1