Use the single wall 45 degree elbow when you need to offset the stove pipe to avoid obsticles like rafters, roof peaks, and other obstructions. Note it is best to install elbows as high above the appliance as possible to avoid draft issues.
Consturction Double Wall Insulated Stove Pipe Sheet Metal
AllFuelHST 30 Degree Elbow Kit for 8 Inner Diameter Chimney Pipe
AllFuel HST 6-Inch Black Pipe Components - AFHST-SB-6
Consturction Double Wall Insulated Stove Pipe Sheet Metal
AllFuel HST 45 Degree Elbow for 6 Diameter Black Single Wall
AllFuel HST 6 x 12 Black Single Wall Stove Pipe
The AllFuel HST Elbow Strap for Class-A Double Wall Chimney Pipe
Supervent® 6 ID x 36 Class A Double Wall Vent Pipe at Menards®
ALLFUEL HST AllFuel 6 in. x 14 in. Tee Double Wall Chimney Pipe
ALLFUEL HST 6 in. Double Wall Elbow Strap BL.EV.RB-SHT6ELS - The