Basement feels damp - Just moved into house, doesn't know where filters are. Go over system with him Customer will buy their own filters, they have 16x26x5 to fit their old electronic air cleaner cabinets. One filter is housed in the attic at the system, some of the returns seem to small to put a filter grill in Found door on main system not closed all the way door switch not closed system ran after properly closing door. Need to start a pcsa but we will not come out until customer has ordered filters in.