Combustion Air Supply And Ventilation - Whirlpool FG1H5040T3NOV Installation And Use 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 Length of Pipe, Feet
Size, in. 10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/2 132 92 73 63 56 50 46 43 40 38 34 31 28 26
3/4 278 190 152 130 115 105 96 90 84 79 72 64 59 55
1 520 350 285 245 215 195 180 170 160 150 130 120 110 100
1-1/4 1050 730 590 500 440 400 370 350 320 305 275 250 225 210
I-I/2 1600 1100 890 760 670 610 560 530 490 460 410 380 350 320
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:
Gas Input of Water Heater (BTU/HR)
Cu. Ft. Per Hr. Required=
Heating Value of Gas (BTU/FT 3)
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.
Table 2
LP Gas Capacity Table
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum gases (at 11 inches water
column pressure). Based on a Pressure Drop of 0.5 Inch Water Column.
Nominal Iron Pipe Length of Pipe, Feet
Size, in. 10 20 30 40 50 60 70 80 90 100 125 150
1/2 275 189 152 129 114 103 96 89 83 78 69 63
3/4 576 393 315 267 237 217 196 185 173 162 146 132
1 1071 732 590 504 448 409 378 346 322 307 275 252
I-1/4 2205 1496 1212 1039 913 834 771 724 677 630 567 511
Example: Input BTU requirement of the water heater I00,000 BTUH
Total pipe length, 80 feet = 3/4" IPS required.
Additional tables are available in the latest edition of the "National Fuel Gas Code", ANSI Z223.1
Combustion Air Supply and
Ventilation
Carbon Monoxide Warning
Follow all the local and state codes or in
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 (but 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.
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.