Aluminum Cube Core Return Air Filter Grille with Plenum Box - 24" x 24" T-Bar Lay-in Drop Ceiling Rectangular Duct Caps It is compatible with 8"

It is compatible with 8" duct

actual front end outer dimensions are approximately 21 5/8" width X 33 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

Our coils have a very high PSI burst pressure

Aluminum Cube Core Return Air Filter Grille with Plenum Box - 24" x 24" T-Bar Lay-in Drop Ceiling Rectangular Duct Caps It is compatible with 8"For Lay In T Bar Ceiling High Quality Aluminum Construction SAVE MONEY ON YOUR BILL PRESERVE YOUR HVAC UNIT Highest Rate Of Air Flow Efficiency Easy Unrestricted Air Flow For Your HVAC System 1 2" x 1 2" x 1 2" Cube Core Offers 90% Free Area Concealed Hinges and Latches to achieve a clean and modern look R6 Fiberglass Back Plenum accepts 6" to 18" Round Spin in Collars or Start Collars (not included) Accepts 1" disposable filter (not included)