Return air

[selfemployed]

20x25 filter grill, 14" flex duct on front of box mostly below center beam. Free area in rear, 4x18 at best. 2.5 ton system. http://www.imagewiz.net/images/hvac/199291_Dsc00013.jpg

[AK Dahlstrom]

Bet it wheezes like crazy and I really like the combustible material present.

[tinmann003]

Dont forget the duct board...