Broan PME300 Power Pack with 290 CFM Internal Blower, 20.5-Inch, Silver Silver paint finish Three speed, slide control Heat Sentry detects excessive heat and adjusts speed automatically. 1 Year Limited Warranty Quiet centrifugal blower, 290 CFM (vertical discharge) 0.5 Sones at normal (130 CFM) Recommended for use with models LB30, LB36, LT30 & LT36 liners