18 in. Width x 36 in. Height - hvacpremiu.shop

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18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille

$94.00 $104.99

18"W X 36"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 37.875"H]

$96.99 $107.99

18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter

$108.99 $120.99

18"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 37.75"H]

$139.00 $154.99

18" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 38 5/8"]

$174.99 $194.00

18"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 37.75"h]

$198.00 $220.00

18" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 38 5/8"]

$221.00 $245.99