Why Does The Furnace NOT Come With A Filter Slot Cover?

Why Does The Furnace NOT Come With A Filter Slot Cover? furnace filter slot This patented two-piece system is designed for 1-inch air filters Placing it over the furnace filter slot eliminates air leakage, which improves indoor air furnace filter slot cover Actual Sizes nominal vs exact hvac air furnace filter size It is better to have a little wiggle room in your HVAC unit slot, so

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az slot If your filter slot on your furnace is exposed, dust and dirt can bypass your filter and go one with at least a Minimum Efficiency Reporting Value 13 rating, or as high a rating as your system fan & filter slot can accommodate