GAS Supply and Piping

CONNECTING THE VENT - Continued

Typical Installation Using

Class “B” Vent Pipe

1.Adequate clearances around floor furnace.

2.Draft Diverter 6” from combustibles.

3.Adequate clearances around vent pipe.

4.Horizontal vent pipe sloping upward 1/4” per foot.

5.Pipe supported with metal straps.

6.Adequate height of vent system.

7.Listed vent cap.

If more than one gas appliance is vented through a common vent system, the vent should be increased in size to accommodate the increased load. Consult your local code or the tables in the latest edition of NFPA54/ANSI.Z223.1 for the correct size. If no local codes apply, use the following alternate method for sizing a vent connected to more than one appliance. The effective area of the vent must be not less than the area of the largest vent connection plus 50 percent of the areas of additional draft hood outlets.

The homeowner appreciates neatness in workmanship and the neat installation usually functions better than the sloppy one. Double check your work to verify that all clearances around the floor furnace and vent system are adequate and that the vent system is installed to code or pipe manufacturers specifications. See Figure 10.

FIGURE 10

The gas piping system must meet the requirements of local codes or the specifications of the servicing gas supplier. It must have adequate capacity to supply the floor furnace and any other appliance within the home with enough gas to maintain the full rated capacities without excessive pressure drop when all appliances are operating at full rate.

GAS PIPE SIZES - CAPACITY - *NATURAL GAS

Length of	INSIDE PIPE DIAMETER
Pipe - Feet	1/2”	3/4”	1”
Pipe - Feet	1/2”	3/4”	1”
1 0	132,000	278,000	520,000
2 0	92,000	190,000	350,000	Capacity
3 0	73,000	152,000	285,000	B.T.U.
4 0	63,000	130,000	245,000	Per Hour
5 0	56,000	115,000	215,000	Input
6 0	50,000	105,000	195,000

*Based on heating value of 1,000 btu per cubic foot (specific gravity of 0.6) @ 0.5 PSIG and a pressure drop of 0.3 inch water column.

GAS TUBING AND PIPE SIZES - CAPACITY - *L.P. GAS

Length of	**Copper Tubing		**Steel Pipe
Pipe/Tubing	Outside Diameter		Inside Diameter
Feet	1/2”	3/4”	1/2”	3/4”
1 0	92,000	329,000	275,000	567,000
2 0	62,000	216,000	189,000	393,000	Capacity
3 0	50,000	181,000	152,000	315,000	B.T.U.
4 0	41,000	145,000	129,000	267,000	Per Hour
5 0	37,000	131,000	114,000	237,000	Input
6 0	35,000	121,000	103,000	217,000

*Undiluted Liquefied Petroleum Gas @ 11 inches water column inlet pressure. Based on a pressure drop of 0.5 inches water column. **Copper tubing must comply with limitations of NATIONAL FUEL

GAS CODE reference 2.6.3 metallic tubing.

***Steel pipe should be of at least standard weight (Schedule 40).

Support the piping or tubing at regular intervals with metal pipe strapping. See chart below.

Nominal Steel	Spacing of
Pipe Size	Supports

1/2”	6’
3/4” or 1”	8’

Nominal size of	Spacing of
tubing O.D.	Supports

1/2”	4’
5/8” or 3/4”	6’

Where local conditions include earthquake, tornado, unstable ground or flood hazards, give special consideration to increased strength and flexibility of piping supports and connections. Consult local authorities for recommendations.

All unused openings in the piping system must be securely closed gas-tight.

Page 8

90N50A, 90N30A, 90N65A, 90N75A specifications

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