Havaco Quick Connect Register Boot with Ceiling Diffuser combinations are even easier to install won t dent or rust and are paintable or with Custom Graphics including wood grain stone camo and other designs. The ceiling boots are 8 6 in. and an 8-7-6 in. reducing model. The diffusers comes in square Capital Crown molding models. Features . Color - White.. Shape - Square.. Ceiling Diffuser.. 8 in. Boot.