36"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 37.25"W x 9.25"H] Condensate Pump Accessories text-align: left Drop Ceilings / Aluminum The set includes a FG1836 HP-1

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 16" or 16" x 10" duct opening (measured at the opening)

but there comes a point when it needs to be replaced outright

+ Product Details Size & Compatibility – The 8" galvanized sheet metal round to oval elbow boot is compatible with duct 8"

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

36"W X 8"H [Duct Opening] Linear Aluminum Clip On Bar Return Air Grille [Outer Dimensions: 37.25"W x 9.25"H] Condensate Pump Accessories text align: left Drop Ceilings Aluminum The set includes a FG1836 HP 1 text align: left + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 16" or 16" x 10" duct opening (measured at the opening)