Tired of climbing ladders and reaching to find air leaks during blower door test I have a solution!!!

Yes, a thermal image camera is a good way, but a better way to instantly see the leak and the cfm amount of the leak-- try using the Alnor thermoanemometer Model 8565.    Cheap on ebay for $100.

 Plus the Alnor has a 4 foot reach.   No need for silly smokers.

Tags: air, blower, door, sealing, testing

Views: 831

Reply to This

Replies to This Discussion

Can you explain how you would use the thermoanemometer and your criteria for air flow to determine excessive leakage?  Besides, doesn't the anemometer measure just velocity (fpm) not volume of air (cfm) unless you know the ft2 area of the opening?  Unless its leakage through a regularly shaped opening, like a wall outlet hole, how do you estimate the area of a crack, for example, to determine cfm?

You haven't convinced us yet. To my knowledge there is not a replacement for IR, smoke, sight, and good old experience. I use the blower door and IR to find air leaks in record time without using a ladder, but if I want to know how much leakage I am seeing there is no gadget for that. Total path zone leakage testing or measuring the hole are your best bet. If you could elaborate on the gadget you speak of and explain how you get a cfm reading I would be open to changing my opinion.

Take for instance when you crack open a bedroom door during a blower door depressurization test, the Thermoanemometer will tell you exactly the fpm of airflow which is easily converted to cfm leakage. This information is not obtainable with an IR, smoker or back of your hand. I am having a great time using this tool. I hate smokers etc.

You really didn't answer how you use that cfm number.  Are you just comparing relative cfm values for each room, or do you have a specific cfm number that indicates excessive leakage?  If just a relative number, why not just use your manometer that you're using already instead of bringing another instrument?

If you have a 300 square foot bedroom, and the cfm is under 400 (roughly) the room becomes a low priority. Also, the Alnor works great around windows especially when the sun is out ( which plays havoc with IR) and windows treatments are present, you simply slide the 40 inch probe behind the curtains and wham, job is done. Last week I was in a home with a fireplace that had a cathedral ceiling, and I could run the probe from the top of the stone fireplace (11 feet high) and found that one side read 450 fpm from top to bottom. (103 cfm leakage). No ladder needed.

It doesn't work like you apparently think it does. Yes, the anemometer head gives you feet per minute of airflow (or some other velocity measurement), but to convert that velocity into a cubic footage measurement you need an exact measurement of the area that ALL of the air is flowing through. You don't have that measurement is you are simply placing the probe next to a piece of trim or a can light or a door gap.

Your method has applicability if you stick the probe into a duct of a known size and find the air velocity. FPM in a duct can be converted into CFM because the area is known. Look up "duct traverse" and look at how the method is presented by various folks. Jim Bergmann has a video or two on this topic using a Testo anemometer.

But, without know the area, you can't get a CFM figure...

Along side of a fireplace with an 11 foot ceiling which has a .25 inch opening along the outer edge. Dave, it is simple math. 9 cfm total at 450 fpm.

does the device have a read out display that shows the CFM #?

-Tammy    ilovewaterheaters.com

Hi Tammy,  The device gives you FPM, which is converted to CFM by multipling FPM by the area and dividing by 144.

You can also get types where you plug in the dimensions and it gives readings in cfm. 

I don't get how this would work for a BD test. The instrument seems to be designed for using in a duct. As it is testing air flow or realistically pressure and converting that number. How are these numbers relative to a induced pressure in a home in specific areas. Would it not read "leakage" in every corner due to flow whether there is a hole or not?

I could understand it working in a cavity such as a can light, duct or other openings communicating between conditioned and unconditioned space.

I do not understand how it would work along side the fireplace in an open space with charged air flowing and swirling from corners or what it would read behind the curtain.

An explanation would be greatly appreciated.  

After looking it up I see that it reads temperature of the probe at a set figure. It reads based on how much it cools down and displays that into data. no flow equals no cool down  It does not read pressure at all. Very cool device.

Still don't get how it works as described

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

Profile IconWes Anderson, Jean-Paul and Bryan joined Home Energy Pros
17 hours ago
Dennis Heidner commented on Dale Stephens's blog post LED Lighting 24-month update 18,240 hours & counting
"Dale, good write up. For the landscaping bulbs,  if they had been T3 12V wedge bulbs,  I…"
yesterday
Brett Little commented on Tom White's video
Thumbnail

The Future of Housing - And How Airtightness Can Help

"It's very true! So many people and contractors have tons of insulated attics but no air seal…"
yesterday
Chris Leach replied to Richard Beyer's discussion "The Dangers of Using Spray Foam Insulation"
"The problems will surface soon enough . Why don't we take a second look at this over rated…"
yesterday
Don Fitchett commented on Tom White's video
yesterday
tedkidd replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"Want to spot a simpleton? It's a guy who thinks EE and comfort are disconnected.  Want…"
yesterday
tedkidd commented on Tom White's blog post Clean Energy Works Oregon: Total Home Performance
"Nice post Tom! I really like how he puts that. Leveraging interests so they can optimize…"
yesterday
Kent Mitchell commented on Tom White's blog post Clean Energy Works Oregon: Total Home Performance
"As a contractor in the region - we frequently wonder how/why you can be a non-profit?  Oregon…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service