Your before-test result is 4000 CFM50. After two days of work, you measure a 21% reduction to 3150 CFM 50. Your after-test is checked using another blower door and they only get a 4% reduction to 3850 CFM50! What gives?

Retrotec CEO, Colin Genges gives his monthly Rants and Raves, see article below:

 

http://retrotec.com/RetrotecBlog/tabid/540/post/colin-rants-before-...

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Good job putting up this post.It puts a better view on accurcy.I watched a video of a guy who had some serious time in this field and he says we should do 10 individual single point tests -EVERY TIME?.I think this puts that in perspective.

Appreciate the feedback William.  The piece comes from our newsletter, if you're not on the list and want to get on, just let me know. Thanks.

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