Used in attics to maintain clearances to blown-in or blanket insulation. Adjustable 12.5" to 23.5" above the joist it attaches to. Also includes a drop-down shield for the joist area.
It is UL listed to standard UL641 as a Type L low temperature venting system. This venting system must be used with appliances requiring this venting standard. Commonly used for wood pellet burning appliances.
1" clearance to combustibles must be maintained when installed.