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Old 10-29-2011, 12:19 PM   #1
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fitting for static pressure test?


Crappy snowy day so I thought I'd try to get some static pressure measurements for my new furnace. I could probably improvise some way to connect up my manometer (1/4" tubing) to the supply plenum but I was wondering what you guys would recommend. Nothing promising at the local Home Depot... all the threaded fittings that had tubing barbs were at least 1/4" on the threaded end. I'd prefer something smaller... like maybe a drilled out automotive grease fitting. What do you guys use?

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Old 10-29-2011, 12:28 PM   #2
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fitting for static pressure test?


I use Pitot tubes

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Old 10-29-2011, 12:29 PM   #3
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fitting for static pressure test?


just for general readings starting right above the A coil at the air handler..just a drilled hole so the tube just bearly slips in static is the duct pressure like in a ballon tranverse it ever 5 '..might want to do a negative check from the filter rack up to the return...any leaking on the supply or return seal it with some brush on sealer...HD/LOWES max's out the system efficiantcy toward your benny.commercially they use a brass tube to sense static when controlling large rooftops and built up air handlers but you can do that tube only for your testing
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Old 10-29-2011, 01:20 PM   #4
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fitting for static pressure test?


Thanks guys, I'll give it a try.
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Old 10-29-2011, 03:08 PM   #5
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fitting for static pressure test?


If you hv a furnace with A/C, the static for the supply is taken between the A/C coil and the furnace. And then between the air filter and the furnace/at the blower.
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Old 10-29-2011, 03:55 PM   #6
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fitting for static pressure test?


Thanks for the tip. I was wondering whether to take it in the plenum or before the coil since the coil will add some backpressure. That'll be easy to test there since I have a 7" spacer between the furnace and N-coil.

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Old 10-29-2011, 03:58 PM   #7
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fitting for static pressure test?


The coil is external to the furnace, so the pressure must be taken before the coil.

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