HTP EFT-155 - Page 45

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LP-387 REV. 12.15.14
Figure 21 – Unbalanced Flue/Vertical Vent - NOTE: Drawing is meant to demonstrate system venting ONLY.
All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼” per foot back to the boiler to allow
drainage of condensate. When placing support brackets on vent piping, the first bracket must be within 1 foot of the boiler and the
balance at 4 foot intervals on the vent pipe. Boiler venting must be readily accessible for visual inspection for the first three feet from the
boiler.
An unbalanced vent system can be installed ONLY when the exhaust is installed in a vertical position.