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

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Search for a slot about one inch wide with a hinged cover or removable cover Where to Find Air Filters in Different Types of HVAC Systems

: FilterLock seals one inch furnace and AC filter slots to improve indoor air quality and reduce utility bills Cover for furnace filter Cover for filter slot The built-in magnets attach Filter Lock to metal duct work and hold it securely in place out of 5 stars Filter Lock Furnace Filter Slot Cover Review -

le slot online che pagano di piu It's a lot easier than trying to fit a sheet metal door and provides a lot tighter seal Great solution to cover opened ac filter slot Works Great metal top already, causing the difficulty from being sagged? The filter is possible in this case Left side: air_ Right