20 in. Width x 18 in. Height

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20" X 18" Steel Return Air Filter Grille for 1" Filter Removable Face/Door
20" X 18" Steel Return Air Filter Grille for 1" Filter Removable Face/Door
$78.08
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(8)
 
20" X 18" Air Vent Return Grilles - Sidewall and Ceiling - Steel
20" X 18" Air Vent Return Grilles - Sidewall and Ceiling - Steel
$38.91
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(21)
 
20"w X 18"h Aluminum Exterior Crawlspace Vent - Rain & Waterproof Air Vent With Screen Mesh
20"w X 18"h Aluminum Exterior Crawlspace Vent - Rain & Waterproof Air Vent With Screen Mesh
$68.21
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20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling
20" X 18" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling
$119.95
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(14)
 
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
$60.96
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20" X 18" 2-Way Vertical AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face
20" X 18" 2-Way Vertical AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face
$41.99
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(18)
 
20" X 18" Steel Return Air Filter Grille for 1" Filter Fixed Hinged
20" X 18" Steel Return Air Filter Grille for 1" Filter Fixed Hinged
$53.99
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(12)