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Finding filter size for duct work measuring 18x19 on downflow gas furnace. : r/hvacadvice
![30" X 12" Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC DUCT COVER - Flat Stamped Face -White [Outer Dimensions: 31.75w X 13.75h] -](https://m.media-amazon.com/images/I/51vOfw0fTFL._SY350_PKmb-play-button-overlay_.jpg "30\" X 12\" Steel Return Air Filter Grille for 1\" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC DUCT COVER - Flat Stamped Face -White [Outer Dimensions: 31.75w X 13.75h] -")
30" X 12" Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC DUCT COVER - Flat Stamped Face -White [Outer Dimensions: 31.75w X 13.75h] -
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SUPPLY AIR DUCT PLENUM 18 X 19 1/2 X 23 1/2 LONG GALVANIZED STEEL 26 GAUGE | eBay
18x19x1 - Air Filter – Air Filters Delivered
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Filter King 18x19x1 Air Filters | 4 Pack | MERV 8 HVAC Pleated AC Furnace Filter | Actual Size 17.5x18.5x1 - Amazon.com
18 x 19 x 1 furnace filter | 65-046
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SUPPLY AIR DUCT PLENUM 18 X 19 1/2 X 23 1/2 LONG GALVANIZED STEEL 26 GAUGE | eBay
Filter King 18x19x1 Air Filters | 4 Pack | MERV 8 HVAC Pleated AC Furnace Filter | Actual Size 17.5x18.5x1 - Amazon.com
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