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Old 12-28-2017, 05:21 AM   #1
JWA
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Blower Motor CFM ?

Not sure this is the right forum for this question........if not someone please direct me.

So about to re-route the air flow out of my 2005 E350 EB rear factory-installed A/C housing. The A/C portion will be disconnected from the front system for a few reasons, main one being I simply don't need A/C in the rear area ever.

Knowing the CFM and recommended static pressure would be helpful determining the new duct size and maximum allowable length of run.

Any help or pointing me in a good direction would be very, very much appreciated.

TIA
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Old 12-28-2017, 10:19 PM   #2
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The CFM can be calculated by measuring the existing duct opening in square feet. They multiply that by the velocity in feet per minute. Get an anemometer to measure the velocity. This one on Amazon will do the job and also measure wind speed.

Having worked in the HVAC industry for many years I doubt that the static pressure is over 0.25”.
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Old 12-30-2017, 05:29 AM   #3
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Quote:
Originally Posted by larrie View Post
The CFM can be calculated by measuring the existing duct opening in square feet. They multiply that by the velocity in feet per minute. Get an anemometer to measure the velocity. This one on Amazon will do the job and also measure wind speed.

Having worked in the HVAC industry for many years I doubt that the static pressure is over 0.25”.
Thanks Larrie---very much appreciate the info, was thinking an anemometer would be helpful so your link will work out just fine.

Once I have this info I hope to best size some type of ducting with 2-3 outlets so heat can be directed overhead by a DIY control scheme.

Thanks again Larrie!
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