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: 149

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

Photos

Loading…
  • Add Photos
  • View All

Latest Activity

Chris Laumer-Giddens's blog post was featured
14 hours ago
Stan Kuhn replied to Sean Lintow Sr's discussion Radon - Passive Systems in the group Best Practices (Residential)
"I did radon testing for 10 years as a home inspector, and in order to be certified to perform the…"
15 hours ago
Chris Laumer-Giddens posted a blog post
20 hours ago
John Livermore's video was featured

Healthy Home Healthy Planet

Find out how we... - Zeroed out our home's carbon footprint - Stopped paying energy bills - Helped the planet And became the 1st renovated home in Massachuse...
21 hours ago
Sean Lintow Sr added a discussion to the group Best Practices (Residential)
Thumbnail

Radon - Passive Systems

Just curious - many locals (per codes) require…See More
23 hours ago
Duncan Cumming posted a blog post

Preparing for Winter: Time for Your Central Heating Check Up

With winter just around the corner, make certain you are not left out in the cold – get your…See More
yesterday
Joe Crisara posted a blog post

Give Your False Assumptions a Knockout Punch

By Derek LauberWe face seemingly unlimited obstacles when trying to manage and grow our…See More
yesterday
Profile IconJoe Crisara, Earth Advantage, Sydney G. Roberts and 6 more joined Home Energy Pros
yesterday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service