A.O. Smith ATX-199 Instruction Manual page 19

Example:
Gas Water Heater
Furnace
Dryer
Worksheet for Your Appliances:
Gas Water Heater
Calculate the Air Volume of the Room
3
NOTE:
Calculate Required Air Volume
3
Required Air Volume (ft ) =Total Appliance Energy
3
Rating
See Install with Outside Ventilation (page 19) if you
199,000
75,000
20,000
Total 294,000
Total
2
3 3 ) per
3
See Install with Outside Ventilation (page 19). For
Install with Outside Ventilation
Determine Type of Ventilation
1.
2.
3.
4.
100 in 2 2
3
5.
Determine Minimum Free Area Required for Each Vent Opening
6
19
Table 6.
3
Table