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CONNECTING THE VENT
FIGURE 7C - RECOMMENDED
FIGURE 8
MORE THAN 10'
RIDGE
RIDGE
10
GAS FIRED VENTED
FLOOR FURNACES
10'
2' MIN.
CHIMNEY OR
METAL PIPE:
3' MIN.
10' OR
LESS
2' MIN.
CHIMNEY OR
METAL PIPE:
3' MIN.
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. Figure 9
FIGURE 9 -
TYPICAL INSTALLATION USING CLASS "B" VENT PIPE
7
6
3
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.
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2
4
3
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