Perforated Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling Height_24in + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 22" OR 22" x 18" duct opening (measured at the opening)

compatible with duct 4" | 10 in a pack - 4 inch diameter pipe – 20 foot length when connected – 30 gauge thick & made of thick & durable galvanized sheet metal

+ Product Details Size - 16"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

Perforated Return Air Filter Grille with Plenum Box - 24 x 24 T-Bar Lay-in Drop Ceiling Height_24in + Product Details Perfect FitFor 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