24" X 48" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Width_12in And is classified as Class SV2414 HP Product Details Perfect Fit 12" Round Duct Pipe

And is classified as Class 1 Fire Proof - B1

For Lay-In T-Bar Ceiling - High Quality Steel Construction

Equipped with a lever for easy airflow adjustment and dampening

actual front end outer dimensions are approximately 24 5/8" width X 24 5/8" height

compatible with 14" duct | 5 in a pack - 2' pipe – 10 foot length when connected – 26 gauge thick & made of thick & durable galvanized sheet metal

24" X 48" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER EASY AIR FLOW LINEAR BAR GRILLES Width_12in And is classified as Class SV2414 HP Product Details Perfect Fit 12" Round Duct Pipe And is classified as Class 1 Fire Proof B1 For Lay In T Bar Ceiling High Quality Steel Construction