Profile: Solar Dynamics, LLC specializes in solar powered attic roof vents. Our product line includes SDF-20, SDF-20CM, SDF-20GM, SDF-20TM, and SDF-20RP.CM. Our SDF-20SF (self flashed base) is designed for sloped low profile roof installations such as composite shingle. The self flashed base is designed to slide under an existing roof. The base is attached to the roof decking with either roofing nails or screws. Our SDF-20GM (gable mount) exhaust fan is designed to fit either onto, or into the existing 16" vertical studs left exposed behind the existing gable vent in the attic.