Furnace Filter Slot Cover [Easy fix to HVAC Air Leak with

slot in the firewall A long, thin rubber seal plugged the slot when the filter was installed The filter could be vacuumed and washed prior to installation

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slot in the firewall A long, thin rubber seal plugged the slot when the filter was installed The filter could be vacuumed and washed prior to installation

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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

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3 Answers 3 Those gaps are normal and don't usually cause a problem When the furnace is running the air pressure forces the filter against