Combustion Air Supply And Ventilation - Whirlpool 201553 Installation Instructions And Use & Care Manual

Table 1
Natural Gas Pipe Capacity Table (Cu. Ft./Hr.)
Capacity of gas pipe of different diameters and lengths in cu. ft. per hr. with pressure drop of 0.3 in. and specific gravity
of 0.60 (natural gas).
Nominal Iron Pipe
Size, in.
10
1/2 132
3/4 278
1 520
1-1/4 1050
1-1/2 1600
After the length of pipe has been determined, select the pipe size which will provide the minimum cubic feet per hour
required for the gas input rating of the water heater. By formula:
The gas input of the water heater is marked on the water heater data plate. The heating value of the gas (BTU/FT )
may be determined by consulting the local natural gas utility.
Additional tables are available in the latest edition of the "National Fuel Gas Code", ANSI Z223.1.
Combustion Air Supply and
Ventilation
WARNING
Carbon Monoxide Warning
Follow all the local and state codes or, in
the absence of local and state codes, the
"National Fuel Gas Code", ANSI Z223.1
(NFPA 54)- latest edition to properly install
vent system.
Failure to do so can result in death,
explosion, or carbon monoxide poisoning.
IMPORTANT: Air for combustion and ventilation must not
come from a corrosive atmosphere. Any failure due to
corrosive elements in the atmosphere is excluded from
warranty coverage.
The following types of installation (not limited to the
following) will require outdoor air for combustion due to
chemical exposure and may reduce but not eliminate the
presence of corrosive chemicals in the air:
• beauty shops
• photo processing labs
• buildings with indoor pools
• water heaters installed in laundry, hobby, or craft
rooms
• water heaters installed near chemical storage areas
20 30 40 50
92 73 63 56
190 152 130 115
350 285 245 215
730 590 500 440
1100 890 760 670
Gas Input of Water Heater (BTU/HR)
Cu. Ft. Per Hr. Required=
Length of Pipe, Feet
60 70 80 90
50 46 43 40
105 96 90 84
195 180 170 160
400 370 350 320
610 560 530 490
Heating Value of Gas (BTU/FT³)
Combustion air must be free of acid-forming chemicals
such as sulfur, fluorine, and chlorine. These elements are
found in aerosol sprays, detergents, bleaches, cleaning
solvents, air fresheners, paint, and varnish removers,
refrigerants, and many other commercial and household
products. When burned, vapors from these products form
highly corrosive acid compounds. These products should
not be stored or used near the water heater or air inlet.
Combustion and ventilation air requirements are
determined by the location of the water heater. The water
heater may be located in either an open (unconfined) area
or in a confined area or small enclosure such as a closet
or small room. Confined spaces are areas with less than
50 cubic feet for each 1,000 BTUH of the total input for all
gas using appliances.
100 125 150 175
38 34 31 28
79 72 64 59
150 130 120 110
305 275 250 225
460 410 380 350
200
26
55
100
210
320
3
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