Here is another install where we converted an old window style AC that let moisture into the suite and was only able to accommodate only a 6,000 BTU Air conditioner (cools only 250 sq. ft.). We converted it to a universal sized through wall AC which protects the building envelope, drains the condensate properly and is able to house a 12,000 BTU air conditioner (Cools aprox 650 sq. ft). The condo owner will now never have to worry about finding the correct size air conditioner in the future as they now have a universal sized sleeve.