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HS/HSS Offset

How to Specify

Using tables from the National Fuel Gas Code or our Sizing & Application Guide, determine the diameter of venting required. The Sizing & Application Guide also offers tips on good design including multi-appliance system sizing and design. The System Design and Installation Guide is an additional resource.

HS/HSS Offset


For use in pairs to permit chimney to “go around” joists, rafters or other projections. Add chimney sections between offsets to produce additional offset. Offsets are available with a stainless steel outer wall for corrosive environments, Model HSS.

AV_pg3 AV HS-HSS Chimney Section prod dim

Available sizes (inches)

Part No.AnglesAB
6HS or HSS-015 154 3/8"4 3/4"
8HS or HSS-015 155"5 1/2"
6HS or HSS-030 304 3/8"4 3/4"