2 x matching 20-25 rafg filter.. filter and 1 can. For main house. Wants to add return for main house unit. Package unit on ground. Unit has crossover. Duct in attic 18†hardpipe with massive return can. Thoughts to add return and connect to it using it as a junction box cause duct can move more air than return can supply. Adding 16†r8 duct. 48.5by38by31.25 sitting on 46 deep by 60â€wide pad. Electrical and gas come out on the left of the unit, gas needs to be rerouted around. Aprox 8’ long 4’ 90 and then 4’ Lip of the water heater door sits at 33.5 Client is a concerned about the transition, wants them to be good.