12 in. Width x 18 in. Height - hvacpremiumb.shop

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12"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 19.75"H]

$33.99 $37.99

18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack

18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack

$35.00 $39.00

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille

$47.00 $52.00

12"w X 18"h Aluminum Adjustable Return/Supply HVAC Air Grille - FULL CONTROL HORIZONTAL AIRFLOW DIRECTION

$49.00 $54.99

18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter

$58.00 $64.99

12" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 20 5/8"]

$59.00 $65.99

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 20.5"]

$61.00 $68.00

12" X 18" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIRFLOW - LINEAR BAR GRILLES

$63.00 $70.00

12"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 19.75"h]

$88.99 $98.00

12" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 14 5/8" X 20 5/8"]

$91.00 $101.99