Concept is workable even for me. Like most all air filters its designed to remove particulates from the air. I change out our HVAC filter about every 3 months... or when ever my thermostat reports a filter change. Possibly the filter box would have to be rebuilt or replaced every 3 or so months?
A steel or aluminum frame could replace the cardboard panel framework to accommodate just replacing the filters instead of the whole duct taped fan/filter box. Or did I miss something?
- Stadtplan likes this