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Elbow Kit includes: 2 Elbows and 1 Elbow Strap. Use for offsets around obstructions such as rafters, ridgepoles, or joists. May use two pair of elbows, if needed. Offsets greater than 30 deg are not permitted in accordance to UL 103 standards. Elbows swivel 360 deg at base (angles are not adjustable). A pair of elbows is required to return an offset chimney back to vertical. Available in stainless steel (5-8 SS) or galvalume (6-8 GA) outer wall.