HC3RN4 3" - 4" INCREASER 6

SPECIAL ORDER ITEM. Review Returns Policy before purchase. This type B gas vent pipe and fittings are use with gas-fired appliances certified for type B venting. Designed for neutral or negative draft applications, B‑vent is intended for vertical installations, including laterals. It may also be used horizontally if a draft-inducing fan ensures all indoor vent portions remain under negative pressure, providing safe and reliable venting performance.