Fits Whitfield Pellet Stoves:Quest FS (WP4) Rectangle Hole in FirebackQuest INS (WP4) Rectangle Hole in FirebackT300P (P11) (T300P/T301P/T305P/T308P)Advantage II-T (WP2) (Serial # 18145 & UP)Advantage III (WP2) (Serial # 18145 & UP)Optima 3 INSProfile 20 FS (< Serial # 7494)Profile 20 FS-2 (> Serial # 7495)Profile 30 FS (< Serial # 11904)Profile 30 FS-2 (> Serial # 11905)Profile 30 INS (< Serial # 11904)Profile 30 INS-2 (> Serial # 11905)