The universal subbase is made of heavy gauge steel to provide mechanical support for the wall sleeve and unit. It provides accurate leveling to maintaining the correct pitch for drainage and prevent the PTAC unit from cantilevering into the room. A subbase should be considered for support on installations where the wall sleeve extends 4 or more inches into the room or the wall thickness is less than 2 inches.  It mounts quickly and easily to the bottom of the wall sleeve and come with adjustable legs and decorative side skirting to provide a finished appearance. The subbase height is adjustable from 3 to 5-1/2 – inches. It will accept receptacle outlet, circuit fuse, power disconnect switch and hardwire modules.