18x24 Vent - 91 items
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18" X 24" Return Air Filter Grille - Filter Included - Easy Plastic Tabs for Removable Face/Door - HVAC Vent Duct Cover - White [Outer Dimensions: 19.75w X 25.75h]

24"W x 18"H [Duct Opening Measurements] Steel Return Air Filter Grille [Removable Door] for 1-inch Filters | Vent Cover Grill, White | Outer Dimensions: 26 5/8"W X 20 5/8"H for 24x18 Duct Opening

24" X 18 Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - Ceiling Recommended - HVAC Duct Cover - Flat Stamped Face - White [Outer Dimensions: 26.5 X 19.75]

24"W x 18"H [Duct Opening Measurements] Steel Return Air Filter Grille (HD Series) Removable Door | for 1-inch Filters, Vent Cover Grill, White, Outer Dimensions: 26 5/8"W X 20 5/8"H for 24x18 Opening

Air Vent Wall Louver 18" X 24" 0.014" 118.8 Sq. In. Free Area 18-1/4" X 24-1/4" Opening Aluminum Whi

18"w X 24"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - Brown [Outer Dimensions: 19.75"w X 25.75"h]

Ekena Millwork GVWVE18X2401SFUWR Vertical Gable Vent Gable Vent, 18"W x 24" (23"W x 29"H Frame Size), Western Red Cedar, Unfinished

24"w X 18"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 25.75"w X 19.75"h]
