Description

IAPMO IGC 339 – Diverting Roof Vent Terminals 1 Scope

1.1 Scope

1.1.1 This Standard covers NPS 1-1/2 and NPS 2 diverting roof vent terminals intended for installation under solar panels to divert the outlet termination point of roof vent pipe or stack in residential and commercial buildings’ DWV systems, and specifies requirements for materials, physical characteristics, performance testing, and markings.

1.1.2 Diverting roof vent terminals covered by this Standard help to:
(a) protect the roof vent pipe or stack when a solar panel is to be placed over the vent; and,
(b) provide equivalent performance to a vent terminating at least 6 inches above the roof.