BDM Dalsin Line 8" x 3ft 304 Stainless Steel 24 Gauge Rigid Liner wall-thermostat Model Dimension 3PPS-AD-M 3" Inner

Model Dimension 3PPS-AD-M 3" Inner Diameter 4PPS-AD-M 4" Inner Diameter Clearance 0” clearance to combustibles / vertical installations Listings ULC S636 is Listed as a Class IIA

You can choose a mounting option based on heater model and what's best for your patio setting

DuraVent 90-Degree DVL Double-Wall Black Elbow

then you do not need this part

BDM Dalsin Line 8" x 3ft 304 Stainless Steel 24 Gauge Rigid Liner wall-thermostat Model Dimension 3PPS-AD-M 3" Inner"Dalsin Line" rigid stainless steel liner and fittings are offered in both type 304 and type 316L stainless steel. The continuous laser weld construction and use of top quality materials make this the professionals choice when lining chimneys servicing wood, pellet, gas, oil, or coal fueled appliances. Features 24 gauge and type 304 Stainless Steel Continuous laser weld construction Precision end formed for best fit Provides for a full 1. 5" overlap