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Table 4: Gas pipe size for distance from natural gas meter or propane second stage regulator
DISTANCE FROM NATURAL GAS METER OR PROPANE SECOND STAGE REGULATOR
Input
Btu/Hr
NAT.
60,000
¾"
100,000
¾"
150,000
1"
200,000
1"
250,000
1 ¼"
300,000
1 ¼"
400,000
1 ¼"
500,000
1 ½"
600,000
1 ½"
7
VENTING
Boilers for outdoor installation are intended to vent using a listed vent cap.
For indoor installations venting must be in accordance with Part 7, Venting of Equipment, of the latest or
current as amended National Fuel Gas Code, ANSI Z223.1, or Section 7, Venting of Equipment and Air
Supply for Appliances, of the CAN/CGA B149, Installation Codes, and applicable provisions of the local
building codes.
Vent connectors serving appliances vented by natural draft shall not be connected into any portion of
mechanical draft systems operating under positive pressure.
Horizontal runs of vent pipe shall be securely supported (approximately every 4 feet) to prevent sagging
and maintain a minimum upward slope of ¼" per foot from the boiler to the vent terminal.
When an existing boiler is removed from a common venting system, the common venting system is likely
to be too large for proper venting of the appliances remaining connected to it .At the time of removal of an
existing boiler, the following steps must be followed with each appliance remaining connected to the
common venting system placed in operation, while the other appliances remaining connected to the
common venting system are not in operation.
a) Seal any unused openings in the common venting system.
b) Visually inspect the venting system for proper size and horizontal pitch and determine that there
is no blockage, restriction, leakage, corrosion or other deficiency, which could cause an unsafe
condition.
c) Insofar as is practical, close all building doors and windows and all doors between the space in
which the appliances remaining connected to the common venting system are located and other
spaces of the building. Turn on the clothes dryers and any appliances not connected to the
common venting system. Turn on any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed, do not operate a summer exhaust fan. Close
fireplace dampers.
d) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust
thermostat so that appliance operates continuously.
e) Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the
flame of a match or candle or smoke from a cigarette.
0-100 FT
L.P.
½"
½"
¾"
¾"
1"
1"
1"
1 ¼"
1 ¼"
100-200 FT.
NAT.
L.P.
¾"
½"
1"
¾"
1 ¼"
1"
1 ¼"
1"
1 ¼"
1"
1 ½"
1 ¼"
1 ½"
1 ¼"
2"
1 ½"
2"
1 ½"
6
200-300 FT.
NAT.
L.P.
1"
¾"
1"
¾"
1 ¼"
1"
1 ¼"
1"
1 ½"
1 ¼"
1 ½"
1 ¼"
2"
1 ½"
2"
1 ½"
2"
1 ½"
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