Perforated Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling Floor Grille + Product Details Size –

+ Product Details Size – 4"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 28"w X 36"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 12" OR 12" x 22" duct opening (measured at the opening)

actual front end outer dimensions are approximately 22 5/8" width X 26 5/8" height

Perforated Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling Floor Grille + Product Details Size –For Lay In T Bar Ceiling High Quality Steel 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 Easy Unrestricted Air Flow For Your HVAC System 50 angled to provide maximum airflow 1 2" Spaced Stamped Louver Face Concealed Hinges and Latches to achieve a clean and modern look R6 Fiberglass Back Plenum accepts