Hi All,

I am trying to figure out a good flow grid system to use for testing airflow in 2 to 5 ton forced air systems.

Any favorites?

Or, if you prefer a flow-hood, please tell my why.

The flow hoods I've used take up more space in my vehicle than I would like.

Thanks for your thoughts.

George

Tags: flow, hoods, tools

Views: 118

Reply to This

Replies to This Discussion

I have 3 hoods - low flow ( 10-500 CFM)  Med flow (40-1500 CFM)  high flow (50-2000CFM) Open grid  for kitchen hoods. Plus hot wire plus presser plus other testing tools.   I test the air flow 3 ways  on each major job just to make my point or so I do not mess up.    Flow hoods have been used for 70 years and there's a lot of groups to help get it right.   look at http://www.trutechtools.com ,  www.nationalcomfortinstitute.com,  www.nebb.org,  https://www.aabc.com/www.tabbcertified.org.  I hope this helps some 80% air systems do not have the air flow to keep the unit on high limit.  

Thanks Eric!

Assuming that you're mainly interested in the total air handler flow, and you have access to the filter slots, I'd suggest looking at Energy Conservatory's TrueFlow.  It's a flat plate with openings; it has adapter plates for a variety of filter slot sizes. You'll also need to drill a hole in the supply plenum (or otherwise get a pressure tap in there).

  http://www.energyconservatory.com/products/trueflow%C2%AE-air-handl...

I like the flat true flow plate when it fits-  if not the by pass is very very large.   Or if the presser is to high  its off some.   I have used 4 True flow plates  on a 2 ton spit system to find air flow.    Quick way is just use paper work that comes with the air handler ( you know the knee pad that come with the unit)  find the right unit using the right MO #  then total CFM reading the fan performance data at a constant speed chart.  to find Total SP use your blower door meter with a SP gauge both side of  motor, 3 of 10 will be off with high turbulence.  Have some fun with it and write about it I will be looking for your comments. 

If you wanted more information on the TrueFlow plate, the manufacturer is offering a webinar on it today: https://events-na11.adobeconnect.com/content/connect/c1/1097690081/...

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Sean Lintow Sr replied to Bud Poll's discussion Inconsistant Local Authotity
"There are actually plenty of them out there like the manufacturers themselves, SPFA, BSC,…"
1 hour ago
Profile IconEthan Bukowiec and Andy Li joined Home Energy Pros
8 hours ago
Bob Blanchette replied to w d's discussion Managing Solar Energy
"Look into passive solar heating. The south windows have enough overhang that the windows are shaded…"
20 hours ago
Steve Waclo commented on Kaplan Clean Tech's blog post The Difference Between Home Inspection and Energy Auditing [Infographic]
"Excellent graphic summary but I don't agree Home Inspectors also check energy use. I believe…"
yesterday
Steve Waclo replied to Linda Wigington's discussion Low-cost electricity monitoring: Accuracy & Applications in the group 1000 Home Challenge
""The problem with plug in energy testers is they miss most of a typical homes energy use. 240v…"
yesterday
w d posted a discussion

Managing Solar Energy

What's the state of the art on managing solar energy (esp. at the home)?There's surely no…See More
yesterday
Bud Poll posted a discussion

Inconsistant Local Authotity

It becomes frustrating to give people modern advice and then have to backtrack and tell them to do…See More
yesterday
Morgan Hunter replied to Isaiah Borel's discussion Blown Cellulose VS Blown Fiberglass in the Attic
"Up here In Canada Fibreglass wins hands down for heat loss! Check back 5, 10 & 20 years later…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service