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View Full Version : Restricted, crimped air ducts?



Jeff Eastman
05-30-2007, 10:24 AM
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DavidR
05-30-2007, 03:25 PM
Jeff,

It wouldn't be a bad idea to recommend that they have the static pressure of the duct system tested to verify proper airflow.

Any equipment attached to a duct system like that is in for a rough run.

DavidR
05-30-2007, 03:34 PM
If you need a contractor in Vegas that does performance testing I can hook you up Jeff.

One of the guys who mentored me lives in Vegas.

Joseph Rago
06-01-2007, 09:42 AM
As a rule, flexible ductwork should not be installed in lengths greater than 8 feet, and with a bend greater than 90 degrees. One could test for "static pressure", but where? Suggest testing for volume delivered at each outlet for a more definitive result.

Joseph D. Rago P.E.
A.E.G.
Yardley PA

DavidR
06-01-2007, 02:46 PM
You could test the total external static pressure to see how much resistance the fan is seeing & you could also measure the static pressure drop of each suspect flex run out.

Most guys can afford a manometer or magnehelic, most don't have anyway of measuring air volume from the registers.

Jerry Peck
06-01-2007, 08:37 PM
As a rule, flexible ductwork should not be installed in lengths greater than 8 feet,

Where is that information from?

Would like to read it.

I know that flexible "air connectors" are not allowed longer than 14 feet, but "flexible duct" length is unlimited.

Thanks.

Rick Hurst
06-01-2007, 09:00 PM
Why not install saddles below the ducts where the strap is restricting the air flow?