15
Page
Your water heater’s BTU/h rating is on the rating plate. The BTU/h ratings should be on the other
appliances’ rating plates. If you have trouble determining the BTU/h ratings, contact the manufacturer
or have a qualified person determine the ventilation requirements.
NOTICE
:
/ĨLJŽƵĂƌĞƌĞƉůĂĐŝŶŐLJŽƵƌŽůĚǁĂƚĞƌŚĞĂƚĞƌǁŝƚŚŽŶĞƚŚĂƚŚĂƐĂŚŝŐŚĞƌdhͬŚƌĂƟŶŐ͕ƚŚĞĂŵŽƵŶƚŽĨ
ǀĞŶƟůĂƟŽŶƌĞƋƵŝƌĞĚŵĂLJďĞŐƌĞĂƚĞƌ͘
Gas Burning Appliance
dhͬŚZĂƟŶŐ
Gas Water Heater
199,000
Furnace
75,000
Dryer
20,000
Total
294,000
Example:
Gas Burning Appliance
dhͬŚZĂƟŶŐ
Gas Water Heater
Total
Your
appliances:
Calculate the air volume of the room
Air requirements depend on the size of the room.
ZŽŽŵsŽůƵŵĞ;Ō
3
Ϳс&ůŽŽƌƌĞĂ;Ō
2
ͿyĞŝůŝŶŐ,ĞŝŐŚƚ;ŌͿ
If there are large objects in the room (e.g., refrigerator, furnace, car), subtract their volume from the vol-
ƵŵĞŽĨƚŚĞƌŽŽŵƚŽŐĞƚĂďĞƩĞƌĞƐƟŵĂƚĞŽĨƚŚĞĂŝƌĂǀĂŝůĂďůĞ͘
Air Volume = Room Volume - Object Volume
EKd͗ĚũŽŝŶŝŶŐƌŽŽŵƐǁŝƚŚƉĞƌŵĂŶĞŶƚůLJŽƉĞŶĞĚĚŽŽƌǁĂLJƐĐĂŶďĞĐŽƵŶƚĞĚĂƐƉĂƌƚŽĨƚŚĞĐĂůĐƵůĂƟŽŶ͘
Calculate required air volume
ǁĂƚĞƌŚĞĂƚĞƌŝŶƐƚĂůůĞĚŝŶĂŶƵŶĐŽŶĮŶĞĚĂƫĐ͕ŐĂƌĂŐĞ͕ŽƌƐƉĂĐĞƌĞƋƵŝƌĞƐƚŚĂƚƚŚĞƐƉĂĐĞďĞĂƚůĞĂƐƚϱϬŌ
3
(1.42 m
3
) per 1,000 BTU/h of the total input for all gas burning appliances in the same area.
ZĞƋƵŝƌĞĚŝƌsŽůƵŵĞ;Ō
3
ͿсdŽƚĂůƉƉůŝĂŶĐĞŶĞƌŐLJZĂƟŶŐ;ďƚƵͬŚͿyϱϬŌ
3
/ 1000 (btu/h)
Example:
;Ϯϵϰ͕ϬϬϬͬϭϬϬϬͿdžϱϬсϭϰ͕ϳϬϬŌ
3
If the air volume of the room is less than the required air volume, you must direct vent the water heater
ŽƌƉƌŽǀŝĚĞƉĞƌŵĂŶĞŶƚŽƵƚƐŝĚĞĂŝƌŽƉĞŶŝŶŐƐƚŚĂƚĚƌĂǁŝŶƐƵĸĐŝĞŶƚĂŝƌ͘'ŽƚŽ͞/ŶƐƚĂůůǁŝƚŚŽƵƚƐŝĚĞǀĞŶƟůĂ
-
ƟŽŶ͟ŝĨLJŽƵǁĂŶƚƚŽƉƌŽǀŝĚĞĐŽŵďƵƐƟŽŶĂŝƌǁŝƚŚŽƵƚƐŝĚĞǀĞŶƟůĂƟŽŶ͘
If the air volume of the room is greater than the required air volume, it may be possible to install the
ǁĂƚĞƌŚĞĂƚĞƌǁŝƚŚŽƵƚŽƵƚƐŝĚĞǀĞŶƟůĂƟŽŶ͘,ŽǁĞǀĞƌ͕ďĞƐƵƌĞƚŽĐŽŶƐŝĚĞƌƚŚĞĞīĞĐƚƐŽĨĞdžŚĂƵƐƚĨĂŶƐ͘
džŚĂƵƐƚĨĂŶƐĐĂŶĂīĞĐƚƚŚĞĂŵŽƵŶƚŽĨĐŽŵďƵƐƟŽŶĂŝƌƚŚĂƚŝƐĂǀĂŝůĂďůĞŝŶLJŽƵƌŚŽŵĞ͘ƉƉůŝĂŶĐĞƐƐƵĐŚ
as furnaces, whole house fans, and clothes dryers draw air out of your home. If they draw air out faster
ƚŚĂŶŝƚĐĂŶďĞƌĞƉůĂĐĞĚ͕LJŽƵƌǁĂƚĞƌŚĞĂƚĞƌŵĂLJŶŽƚŚĂǀĞĞŶŽƵŐŚŽdžLJŐĞŶƚŽĮƌĞƉƌŽƉĞƌůLJ͘ĂĐŬͲĚƌĂŌŝŶŐ
ŵĂLJĂůƐŽƌĞƐƵůƚ͕ǁŚŝĐŚŝƐǁŚĞŶŶĞŐĂƟǀĞĂŝƌƉƌĞƐƐƵƌĞƉƵůůƐĂŝƌďĂĐŬǁĂƌĚƐƚŚƌŽƵŐŚĐŚŝŵŶĞLJƐŽƌĂƉƉůŝĂŶĐĞ
ǀĞŶƚƐ͘dŚĞƐĞĞǀĞŶƚƐĐĂŶĐĂƵƐĞƵŶƐĂƟƐĨĂĐƚŽƌLJǁĂƚĞƌŚĞĂƚĞƌƉĞƌĨŽƌŵĂŶĐĞ͘dŚĞďĞƐƚƐŽůƵƟŽŶŝƐƚŽĚŝƌĞĐƚ
ǀĞŶƚƚŚĞǁĂƚĞƌŚĞĂƚĞƌŽƌŝŶƐƚĂůůĂŶĂĚĞƋƵĂƚĞŶƵŵďĞƌŽĨŵĂŬĞͲƵƉĂŝƌǀĞŶƚƐ͘;^ĞĞ͞/ŶƐƚĂůůǁŝƚŚŽƵƚƐŝĚĞǀĞŶƟ
-
ůĂƟŽŶ
”
͘Ϳ&ŽƌŵŽƌĞŝŶĨŽƌŵĂƟŽŶ͕ĐŽŶƐƵůƚĂƋƵĂůŝĮĞĚƚĞĐŚŶŝĐŝĂŶŽƌLJŽƵƌůŽĐĂůŐĂƐƵƟůŝƚLJ͘
Install with outside ventilation
sĞŶƟůĂƟŽŶǁŝƚŚŽƵƚƐŝĚĞĂŝƌŝƐƌĞĐŽŵŵĞŶĚĞĚ͕ĂŶĚ͕ĨŽƌŵŽƐƚŝŶƐƚĂůůĂƟŽŶƐ͕ŝƐŶĞĞĚĞĚ͘dŚĞƌĞŵĂLJďĞĞdžŝƐƟŶŐ
ǀĞŶƟůĂƟŽŶƚŚĂƚŝƐĂĚĞƋƵĂƚĞ͕ŽƌLJŽƵŵĂLJŶĞĞĚƚŽĂĚĚŵŽƌĞǀĞŶƟůĂƟŽŶ͘
Supplying outside air to the water heater typically requires two openings. One opening must be within 12 in
;ϯϬϱŵŵͿĨƌŽŵƚŚĞŇŽŽƌĂŶĚƚŚĞƐĞĐŽŶĚŽƉĞŶŝŶŐŵƵƐƚďĞǁŝƚŚŝŶϭϮŝŶ;ϯϬϱŵŵͿĨƌŽŵƚŚĞĐĞŝůŝŶŐ͘ůƚŚŽƵŐŚĂ
single opening is not preferred, you may use a single opening to outside air if the minimum free area is sized
according to
Table 1
͘dǁŽŽƉĞŶŝŶŐƐŵƵƐƚďĞƵƐĞĚǁŚĞŶǀĞŶƟůĂƟŶŐǁŝƚŚĂŝƌĨƌŽŵĂŶŽƚŚĞƌƌŽŽŵ͘
dŚĞŽƵƚƐŝĚĞĂŝƌĐĂŶďĞƚĂŬĞŶĨƌŽŵĂĐƌĂǁůƐƉĂĐĞŽƌĂƫĐŽƉĞŶƚŽƚŚĞŽƵƚĚŽŽƌƐĂŶĚĂĚĞƋƵĂƚĞůLJǀĞŶƟůĂƚĞĚ͘
zŽƵŵĂLJƵƐĞǀĞƌƟĐĂůŽƌŚŽƌŝnjŽŶƚĂůĚƵĐƚƐ͘
/ŶƐƚĂůůĂƟŽŶ
/ŶƐƚĂůůĂƟŽŶDĂŶƵĂů
Printed on 12/6/2017 8:34 AM CT
