Has anyone seen pleated HEPA filter that fit into floor register vent?
I froogled but no luck. Maybe nobody makes such product.
The closest I found are sheets filters like this:
Of all the different hepa filters made in this world (some for vacuum cleaners, some for air purifiers, etc), perhaps there is one that happens to fit in a 3 7/8 inch x 11 5/8 inch rectangular space (inside dimension of a vent register)?
Any ideas?