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