Concentric Venting - A.O. Smith BTH 120 Series Service Handbook

CONCENTRIC VENTING

Concentric venting allows for a single wall penetration. For multiple water heater installation using this vent
practice, any additional vents of this type may be located 12" (30.5 cm) on centerline to either side of the
first vent or 12" (30.5 cm) on centerline vertically above the first vent. Concentric kits may be extended to a
maximum allowable length of 5 feet (152 cm). Schedule 40 PVC pipe must be carefully measured and cut
to the desired length. Do not use couplings when extending the length of a concentric termination. The use
of couplings will restrict the flow through the termination and may cause improper combustion. For more
information please refer to the Instruction Manual.
BTH Concentric Vent for 120 through 250.
BTH Concentric Vent for 300 through 500.
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Servicing should only be performed by a Qualified Service Technician