
QTD2
Series
23
3.0
Installation
•
Common Venting
Figure 3.13
•
Common Rooftop Venting - Side View
Common Venting
• When joining two heaters to a common vent, a staggered arrangement or a dual exhaust assembly
(P/N: YSM) must be used so by-products of one heater do not flow into the adjoining vent of the
other heater.
• 6 in. diameter double-wall Type B-vent and 6 in. vent cap must be used.
• Common vented heaters
must
be
controlled with the same thermostat.
Do not operate individually
.
*Consult the NFPA ANSI Z223.1 Gas Vent
Termination criteria if roof pitch exceeds 9:12.
Rooftop Vent Cap
Roof
Dual Exhaust
Assembly
Heater
Double-Wall B
Vent
24 in.
Min.*
Heater
Vent
Adapter
Vent
Collar
Firestop Spacer