Is there a place online where I can read about the exhaust gas of a natural
gas appliance? I want to know what it consists of, how hot it is, etc.
This is just academic interest, and not any kind of harebrained scheme for
everyone to start flaming me about.
Does anyone know the rough details? Roughly how hot, and what are the
major component gasses?
Again... typical for what part of the country?? 90+AFUE furnaces or 80+AFUE
Can't tell you about water heaters... you will have to ask a turd chaser for
Now tell me... just what kind of homework are you doing?? and for what
The question is where I can read about such things. Basically, the
temperature and components of natural gas exhaust. I would expect such
reading matter to include discussions of the differences from different
appliances. Does anyone know of any online resource with this kind of
This isn't about a particular appliance or application, nor is it for a
class. It's just that I'm curious to know what's in that exhaust gas, and
how hot it gets. Maybe I will get asked some such question when I'm on
"Who Wants to be a Millionaire" someday. If they ask me Benedict Arnold's
mother's maiden name, I already know that, and this is logically the next
question I should learn.
Category I Appliance: Operates with neutral/negative vent static pressure,
flue gas temperature does not exceed 550 degrees, and conforms to NFPA 54 &
UL 441 (B Vent).
Category II Appliance: Operates with neutral/negative vent static pressure,
flue gas temperature is less than 140 degrees (F) above dew point
temperature. May cause excessive condensation and conforms to NFPA 211 and
UL 1738 (Corr/Guard).
Category III Appliance: Operates at a positive static vent pressure (at the
appliance) at a temperature that does not permit condensation. Conforms to
NFPA 211 and UL 103 (PIC, IPIC, PSW).
Category IV Appliance: Operates at a positive vent static pressure, flue gas
temperature is less than 140 degrees (F) above dew point temperature. May
cause excessive condensation and conforms to NFPA 211 and UL 1738
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