36" X 8" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 38 5/8" X 10 5/8"] white actual front end outer dimensions Drop Ceilings / Aluminum FLTR M8 308x3 Actual Filter Size 23

actual front end outer dimensions are approximately 34 5/8" width X 36 5/8" height

actual front end outer dimensions are approximately 27 5/8" width X 34 5/8" height

Energy Efficient – Air-tight inner core decreases the pressure loss and provides a more hygienic environment - high energy efficient / No fiberglass erosion into air stream

Whether you're restoring an old Victorian or craftsman style home

+ Product Details Universal Fit - Accommodates almost any thermostat with dimensions of 8-1/4" H x 5-3/8" W x 3-1/2" D

36" X 8" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 38 5 8" X 10 5 8"] white actual front end outer dimensions Drop Ceilings Aluminum FLTR M8 308x3 Actual Filter Size 23 actual front end outer dimensions are approximately 34 5 8" width X 36 5 8" height actual front end outer dimensions are approximately 27 5 8" width X 34 5 8" height