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    20 in. Width x 18 in. Height

    20" X 18" Air Vent Return Grilles - Sidewall and Ceiling - Steel
    20" X 18" Air Vent Return Grilles - Sidewall and Ceiling - Steel
    (65)
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    20" X 18" Air Vent Return Grilles - Sidewall and Ceiling - Steel $30.11 USD
    20" X 18" Steel Return Air Filter Grille for 1" Filter Removable Face/Door
    (8)
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    20" X 18" Steel Return Air Filter Grille for 1" Filter Removable Face/Door $59.99 USD
    20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling
    (41)
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    20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling $75.15 USD Out of Stock
    20" X 18" Aluminum Return Grille
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    20" X 18" Aluminum Return Grille $41.28 USD
    20"w X 18"h Aluminum Exterior Crawlspace Vent - Rain & Waterproof Air Vent With Screen Mesh
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    20"w X 18"h Aluminum Exterior Crawlspace Vent - Rain & Waterproof Air Vent With Screen Mesh $49.28 USD Out of Stock
    20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter
    20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter
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    20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter $58.95 USD Out of Stock
    20" X 18" 2-Way Vertical AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face
    (28)
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    20" X 18" 2-Way Vertical AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face $39.99 USD Out of Stock
    20" X 18" Steel Return Air Filter Grille for 1" Filter Fixed Hinged
    (12)
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    20" X 18" Steel Return Air Filter Grille for 1" Filter Fixed Hinged $70.02 USD Out of Stock

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