For Ceiling Slopes of: Use this SunPipe-13 diffuser shape: Horizontal to 6/12 Std. Round 6/12 to 8/12 8/12 Oval 8/12 to 12/12 12/12 Oval
Alternatively, you can allow the pipe to extend slightly below a sloped ceiling and use our round diffuser by attaching it to the pipe via a flange ring (sold separately). A small portion of the pipe may be visible but, painted to blend with the ceiling it looks fine.
The round SunPipe-9 diffuser dome works on ceilings up to a 7/12 slope.
The round SunPipe-21 diffuser dome works on ceilings up to a 2/12 slope.SunPipe® - The Better Way To Skylight