Stephen Standley
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Which reading is more reliable on a Minneapolis Duct Blaster?
19 Replies

I have recently switched to using a Minneapolis Duct Blaster and have noticed that switching the rings has been resulting in varying results. My question is which reading is more accurate? I know…Continue

Started this discussion. Last reply by Paul Morin Aug 22.

 

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Stephen Standley joined Leslie McDowell, BPI's group
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Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization for residential energy efficiency retrofit work.See More
Nov 18
Paul Morin replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"Sorry for chiming in so late.  Sean’s comment early on in the discussion was the closest to the point.  160 CFM is off the calibration charts on the high end.  Your Duct Blaster® Ring 3 may be able to top out at 160 CFM with…"
Aug 22
Michael Dunseith replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"Colin, "take a reading and assume it was ok?" Assumptions, Ah yes good point. Well taken. "
Aug 15
Colin Genge replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"Michael, how do you know the tester would not start out with Ring 3, take a reading and assume it was ok? What this repeated test is pointing to is that there is a problem here, so what is it? Is Ring 3 out of calibration for some reason, was the…"
Aug 14
Michael Dunseith replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"If your getting a good reading with the 2 ring on, using a DG 700 and it is not flashing LOW then that is the proper flow range. Sure you could put on a 3 ring and get a different number but why? The 2 ring matches the flow range. The 3 ring has a…"
Aug 14
Colin Genge replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"  I suggest checking your gauge and Duct Blaster on a regular basis with this simple set up. You’ll learn a lot and have fun too. The Principle is, if what you are blowing into, a duct or flex with a hole in it, is at the same pressure…"
Aug 11
Stephen Standley's discussion was featured

Which reading is more reliable on a Minneapolis Duct Blaster?

I have recently switched to using a Minneapolis Duct Blaster and have noticed that switching the rings has been resulting in varying results. My question is which reading is more accurate? I know that each ring is used depending on the amount of leakage in the duct system, however it doesn’t seem clear which ring I should be using. Yesterday I test a 1.5 ton system in a condo and I used the #2 ring. I got a result of 240 CFM then I put in the #3 ring (smallest one) and got 180 CFM. Which one is…See More
Aug 11
Allan G Hurst replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"I often change rings to qualify my findings. With the numbers you stated, my experience leads me to think you forgot to change the configuration setting."
Aug 9
Bob Klahn replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"Stephen, A good rule of thumb when you get readings that stretch credibility - or just don't make sense - Break down your (DG) set-up and redo it.  That will often make a glitch , like not switching the gauge to match the ring, stand…"
Aug 7
Stephen Standley replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"Thats why I was confused on my readings because I'm still getting a reading outside of what the CFM should be for that ring. If it is out of range does that mean its wrong? I did a field calibration and I'm slightly higher than the CFM of…"
Aug 7
Stephen Standley replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"No I only switched once."
Aug 7
Stephen Standley replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"Thanks for the info, I have been going with the number that I get with the smaller ring so that makes me feel more confidant. Yes I changed the setting on the manometer."
Aug 7
Eric Kjelshus replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"It may not be the Blaster but the water vapor presser inside, air speed outside.  I have also found duct leaks change with attic temp.  I have found return air leaks if in a stud of wall change with Relativity Humidity in wood and sheet…"
Aug 7
Brennan Less replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"To reiterate what Glen said, always use the smallest ring that allows you to achieve the desired level of (de)pressurization. It will always be the most accurate reading available. "
Aug 7
John Nicholas replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"You were testing leakage to the outside and total leakage, and also doing a Blower Door Test on the condo?   If so,  what surfaces were your sealed vents on.  Drywall? Laminate/tile Flooring? Carpet?   How did you seal those?…"
Aug 7
eric anderson replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"Just checking all the bases.  Did you remember to switch configurations on the dg 700 to account for the different rings?  That would certainly make a difference.   I built a test box- 2 ft square where the duct blaster attaches to…"
Aug 7

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Austin's ECAD Specialist
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Professional Building Analyst
Professional Interests
Energy audits, energy savings
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http://www.ecadspecialist.com

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