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Table of Canadian Minimum Area of Combustion and Ventilation Air Openings
P-K
®
THERMIFIC
Model #
N700
N1000
N1500
N1700
N2000
3.5.3 Flue Venting
®
P-K THERMIFIC
boilers are Category I appliances, as defined in ANSI Z21.13/CSA 4.9, latest edition.
®
The P-K THERMIFIC
Category I venting systems as specified in the latest edition of NFPA 54/ANSI Z223.1 in the US or the
latest edition of CAN/CSA B-149.1 in Canada.
This boiler is suitable for use with Type "B" vent.
The exhaust vent can be run horizontally or vertically.
Vent installations shall be in accordance with NFPA54/ANSI Z223.1, the National Fuel Gas Code, or
CAN/CSA-B149.1, the Natural Gas and Propane Installation Code, or applicable provisions of the local
building codes.
If the boiler is installed using sealed combustion / direct vent, see Section 3.5.5.
3.5.3.1
Vent Sizing
The vent must be sized in accordance with the ASHRAE Systems and Equipment handbook, Chapter 30
or according to the vent manufacturer's recommendations. When using manufactured venting systems,
consult your vent supplier for correct sizing and structural support requirements. Vent diameter is
dictated by the length and height of horizontal and vertical portions of the vent installation and materials
of construction.
Table of Vent Design Parameters
P-K THERMIFIC
el
N700-N2000
Design calculations should be based on a negative 0.04" W.C. with a stack temperature of 325º F (gross)
and a CO
level of 7.6%; (these values are to be used for vent sizing calculations.) The maximum
2
allowable length of the vent duct, including the boot tee/135º tee (not a standard tee) and the termination
is 100 equivalent feet. See the table below for the equivalent length of fittings used in the venting system
Required Combustion Air
Input
Btu/Hr
in
700,000
100
1,000,000
143
1,500,000
179
1,700,000
193
2,000,000
214
boiler may be vented with any venting systems meeting the requirements of
®
Mod-
Stack Draft
-0.04"
Opening
2
2
mm
64,516
92,257
115,484
124,516
138,064
Stack Temperature
325°F
16
®
P-K THERMIFIC
Gas-Fired Boiler
Ventilation Air Opening
2
2
in
mm
10
6,452
14.3
9,226
17.9
11,548
19.3
12,452
21.4
13,806
CO
Natural Gas
2
7.6%
CO
LP Gas
2
8.9%
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