Raypak XTherm Series Installation & Operating Instructions Manual page 33

VENT CAPS STACKED VERTICALLY
FLUE GASES MOVING IN PARALLEL
4'-0" MIN.
(TYP)
DISCHARGE
VENT CAPS ALL AT SAME ELEVATION
FLUE GASES MOVING TOWARD EACH OTHER
2" MINIMUM (TYP)
DISCHARGE
4'-0" MIN.
(TYP)
VENT CAPS AT STAGGERED ELEVATIONS
FLUE GASES MOVING TOWARD EACH OTHER
Fig. 35: Sidewall Vent Cap Configurations
1" MINIMUM (TYP)
1" MINIMUM (TYP)
Fig. 36: Typical Common Venting
33
WARNING: Vent connectors serving any other
appliances shall not be connected into any portion of
mechanical draft systems operating under a positive
pressure. If an XTherm heater is installed to replace
an existing heater, the vent system MUST be veri-
fied to be of the correct size and of Category IV UL
Listed stainless steel vent material construction. If it
is NOT, it MUST be replaced.
NOTE: For extractor sizing, typical CO
9.7% for natural gas and 11.2% for propane gas and
flue temperature of 350°F, at 100% firing rate. mea-
sured at a test port, 12" above the flue collar.
Model Vent Size Vent Pressure
No. (in.)
2505
3005 10
3505
4005 12
* NOTE: Data for 100% firing rate.
Table P: Typical Vent Pressure and Volume
of Flue Products
levels are
2
Volume of
Flue Products
(in. WC)
(CFM)
0.2 800
0.3 960
0.3 1120
0.3 1280