Draft Inducer kit, bolts to existing draft hood mount (fan included). Must use 5-amp fuse. Application: For Classic CL 4030, CL 5036 & CL 6048 models with STEEL doors for serial numbers below: Use for Classic CL 5036 NON-TITANIUM models with serial # range Classic 501230-Classic 501264. Use for Classic CL 6048 NON-TITANIUM models with serial # range CL601232-CL601342. Use for Classic CL 4030 TITANIUM models with serial # CLF400000 and up. Use for Classic CL 5036 TITANIUM models with serial # CLF500000 and up. Use for Classic CL 6048 TITANIUM models with serial # CLF600000 and up.