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18 in. Width x 12 in. Height

18" X 12" Air Vent Return Grilles - Sidewall and Ceiling - Steel $31.84 USD Out of Stock
18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 14 5/8"] $61.56 USD Out of Stock
18" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling $59.03 USD Out of Stock
18" x 12" Pleated MERV 8 Allergen Filter for HVAC Return Filter Grille $10.13 USD Out of Stock
18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter $43.95 USD Out of Stock
18" X 12" Aluminum Return Grille - Easy Airflow - Linear Bar Grilles $40.70 USD Out of Stock
18" X 8" Aluminum Return Grille - Easy Air Flow - Linear Bar Grilles $36.94 USD Out of Stock
18" X 12" 3-Way AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face $26.50 USD Out of Stock
18" X 12" 2-Way Vertical AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face $26.99 USD Out of Stock