Complaint; hi humidity in wall. ??? Found supply plenum hanging loose from AHU, blowing vast amount of old air into attic Made repair Noted further: AHU in right hand discharge NONE of the necessary changes have occurred to go from Left hand discharge to Right hand discharge as well as some necessary parts are missing AND the drain to outside is run in 1/2" PVC pipe Yes AHU is a drainage disaster waiting to happen. Quoting new system Home needs load calculations before estimate is finalized AND ducting will be a separate price