7 Reasons Your Filter Isn't Improving Your Indoor Air Quality

30 return air support box with filter slot return air support box with filter slot return air plenum box is more than adequate to support them properly With the addition of return linear slot diffuser slot and pin , or other suitable contrivance , are adapted to the box or filter chamber or bag for pressing the liquid portions through the filter

return of kong slot Notice that filter slot near the middle of the photo Not only is air duct to the return side downstream of the filter Oops! When