Converting 1 filter frames to accept 4 filters

metal furnace filter slot cover   Dan metal slot drain

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 -

cover 398 coyote 399 crack 400 cradle 401 craft 402 cram 403 crane 404 filter 693 final 694 find 695 fine 696 finger 697 finish 698 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

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