Found this on a twenty ton Trane air handler. Unit has a two inch filter rack and customer does there own filters. I told the customer about needing two inch filters and where to buy them. Returned the next day and customer had replaced with clean 1" filters. He said someone else told him to use that size. Oh well I'm sure I'll be dragging my hose into that attic again soon. ;)
Don't you know that the homeowner's mistress always knows more about their system than you do. You just want to screw them, she wants.................um.........