The Manufacturer recommends installation be performed by a licensed contractor, licensed electrician or equivalent.Step 1. Remove the system from the shipping container. Open service door, remove Pre-Filter and Carbon Filter. Replace Carbon Filter, Pre-Filter (white out) and close service door. Remove the adjustable louver door from inside the system. After you have removed the adjustable louver door, remove the 2" piece of weather strip (discard) and the H.E.P.A. bar and then slip out the H.E.P.A. Filter. The H.E.P.A. Filter is a pleated media surface in a metal frame. Removing the H.E.P.A. Filter will make the system lighter for installation purposes. Replace H.E.P.A. Filter and H.E.P.A. bar after unit is installed. Make sure the H.E.P.A. Filter and H.E.P.A. bar are in tightly.