Share 'Before and after leakage tests. What to expect.'
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:
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