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045S/045F — 45° Elbows

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.

Amerivent FAQs

045S/045F — 45° Elbows


The flat 45° elbow is used in pairs where offsets are desired in 1" minimum clearance enclosures or open spaces, such as attics or basements. Add pipe sections between pairs to produce additional offset.

AV_O45F_TBGV line art 45-degree elbow-flatAV_O45S_TBGV line art 45-degree elbow-standard

Available flat sizes (inches)

4045F4"3 3/4"3 3/4"
5045F5"4 3/4"4 3/4"

Available standard sizes (inches)

5045S5"3 1/2"3 1/2"