350 CFM 6.5 Sones. (HVI) • Installs easily between ceiling joists. • Fits 10” round duct – use Model 472 transition/damper (available separately) for 8” round duct. • 10-1/4” diameter and 9-15/16" high housing. • CSA Certified. Efficient, high-performance for ceiling installations. Offered in two sizes to meet various room requirements.