Selkirk 208211 Insulated Type A Elbow Kit, 8", 30 DegreeHighlights: Size: 8" Fewer code infractions Can be used for fixed offsets of 30 degrees slope Greater angles are prohibited by UL Standard 103 and by the terms of the product listing Required: Locking bands (2 packaged with each elbow kit) are to be used at each joint Each offset must be resupported Elbows rotate 360 degrees to provide the exact orientation required Insulated elbows can be used at the same 2'' air space clearance as chimney sections