Intertherm Roof Jacks Srj3 Roof Jack Assy 25" 36" 36in. SRJ Roof Jacks are compatible with all CMF2 Oil/Gas Gun Furnace models. Assembly includes: flashing barrel ceiling trim plate and vent. Roof Jack Vents are used to provide furnaces with fresh air for combustion and vent out flue gasses. Check manufacturer recommendations to ensure a proper fit. Features of Intertherm Roof Jacks Srj3 Roof Jack Assy 25" 36" Must be installed on a flat surface Roof Jack Assembly #104060015 (SRJ3) is designed for roof cavities 25" to 36" (ceiling to roofline) Compatible with all CMF2 Oil/Gas Gun Furnace models Assembly includes: flashing barrel ceiling trim plate and vent Roof Jack Vents are used to provide furnaces with fresh air for combustion and vent out flue gasses Package Contents: Intertherm Roof Jacks Srj3 Roof Jack Assy 25" 36" Intertherm 104060015: Roof Jacks Srj3 Roof Jack Assy 25" 36" 36in