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: 126

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

Brett Little posted events
3 hours ago
Brett Little posted a photo

What is your home MPG?

The residential energy performance score is here!
3 hours ago
Barry NewDelman replied to Barry NewDelman's discussion How to give back to your Customers in the group Marketing Energy Efficiency
"Kent: Depends on how look at it , I have saved 100's of customers save anywhere  from…"
14 hours ago
Kent Mitchell replied to Barry NewDelman's discussion How to give back to your Customers in the group Marketing Energy Efficiency
"Phishing? MLM? "
14 hours ago
Barry NewDelman added a discussion to the group Marketing Energy Efficiency
Thumbnail

How to give back to your Customers

Help your Customers get free energy , Open enrollment untill February 13 th in the most Successful…See More
14 hours ago
Bud Poll replied to Bud Poll's discussion CO poisoning in Yarmouth Maine
"Don't I hate links that vaporize over night.  I did a search and found…"
15 hours ago
Tom White's video was featured
17 hours ago
Sean Lintow Sr replied to Bud Poll's discussion CO poisoning in Yarmouth Maine
"Link doesn't work Bud? I doubt Direct Vent as the lack of oxygen should trip the safeties -…"
18 hours ago

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service