Intertherm Roof Jacks Srj1 Roof Jack Assy 0in 12in. 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 104060000 Roof Jacks Srj1 Roof Jack Assy 0in 12in Must be installed on a flat surface Roof Jack Assembly #104060000 (SRJ1) is designed for roof cavities 0" to 12" (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 104060000 Roof Jacks Srj1 Roof Jack Assy 0in 12in Intertherm 104060000: Roof Jacks Srj1 Roof Jack Assy 0in 12in