When is a duct booster fan OK?

[Joe Mascitti]

Use 241 and 137....that would equal 822BTU and 468 BTU


How does that equate to temp


Thanks


Joe

[Joe Mascitti]

"Wouldn't this also be true if the ductwork was sized correctly in the first place? A system only makes a max amount of airflow that is distributed right"

Does the booster fan increase CFM above the system design?


Joe

[beenthere]

temp rise =BTU/(CFM*1.08(at sea leel))

[pstu]

I install Fantec stuff. Correcting the duct work would be great, but sometimes you run into a lengthy branch that has minimal static pressure and virtually no throw.
So I install a 6 in in-line booster fan with a variable speed controller that's wired to come on with the indoor blower. These little fans can kick it out!, but you must realise that they are stealing air from someplace else.

If the power were off to such a fan, the added restriction of the fan itself would greatly reduce airflow, right? Just trying to learn what is what. It seems to me that power to the fan would be necessary in order to get anything like the original airflow. But as has been shown before, sometimes my impression can be dead wrong<g>.

Thank you -- Pstu