Reason for 2 1 filter slots on hvac Merv 2 and 5

return air box with filter slot   Dan return air box with filter slot

Furnace Return Air Box with Filter Rack - x Model: FB2128 $ Ships in 2-3 Weeks Add

The focal point of todays video is to highlight how easy it is to make a filter slot in the return air Enhance air circulation in your HVAC system with our return air boxes, designed for efficient air return and filtration

diamond king slot Furnace Return Air Box with Filter Rack - x Model: FB2128 $ Ships in 2-3 Weeks Add Promise does not apply if the product is reconditioned, refurbished, used, damaged, returned, open box or a demonstrator product Air