The air should be twenty or so degrees hotter than the return air. Sounds
like you have too little air flow.

--
Christopher A. Young
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www.lds.org
..


"Sudy Nim" wrote in message
...
My electronic air filter just died and I substituted a replacement type air
filter. Is there a normal average or rule of thumb to determine if output
temperature is excessive on a gas-fired furnace? I know there are devices to
prevent over heating but I just wondered if this filter was blocking
airflow.
The output is 150°F.