This is all wrong. Our furnace filters (and all furnace filters) filter particles specifically to clean the air. And with a MERV 13 or higher rating, they even

This is all wrong. Our furnace filters (and all furnace filters) filter particles specifically to clean the air. And with a MERV 13 or higher rating, they even filter Pm 2.5. And, no, I’ve never seen a single furnace filter with intentional gaps around the filter.