Common Venting
• A staggered arrangement or a dual exhaust assembly (P/N: DB-Y) must be used when joining two
heaters to a common vent so that by-products of one heater do not flow into the adjoining vent of
the other heater.
• 4 in. diameter double-wall Type B-vent and 4 in. vent cap must be used.
• Common vented heaters
must be
controlled with the same thermostat.
Do not operate individually
.
Figure 3.23
•
Common Rooftop Venting - Side View
Figure 3.24
•
Common Sidewall Venting - Top View
Double Wall B-Vent
*Consult the NFPA ANSI Z223.1 Gas
Vent Termination criteria if roof pitch
exceeds 9:12.
4 in. Rooftop Vent Cap
Roof
Dual Exhaust Assembly
P/N: DB-Y
Heater
Firestop Spacer
4 in. Double Wall B Vent
24 in.
Min.*
Heater
Heater
Dual Exhaust Assembly
P/N: DB-Y
Sidewall
4 in. Sidewall Vent Cap
(P/N: SWD-4)
Wall Thimble
B To C
Adapter
4 in. Single Wall Vent
6 in.
min.
Heater
3 in. Single Wall
Vent Pipe
27
3.0
Installation
•
Common Venting
LS
Series