Just because a fan says it flows a certain amount of CFM, it does not mean that it is actually true. Several homes applying for the Energy Star V3 program have failed, due to a small thing; bath fans need to have a minimum of 50 CFM. Without this, the house can not pass for the program.
To solve the problem, several house builders thought about installing bigger fans, to hit the 50 CFM minimum, but that did not solve the problem as many of them could not even hit that. Many of the fans claimed to flow 110+ CFM, but half did not even hit 50. That is quite crazy to think and is obviously not the way to go.
Details count & even then U are looking at 80% rated: This Little Hitch Snares ENERGY STAR Homes http://t.co/7NE6NlOVwt via @EnergyVanguard
— Sean Lintow Sr. (@The_HTRC) August 21, 2013
Find out more about this hitch here – http://www.energyvanguard.com/blog-building-science-HERS-BPI/bid/69905/This-Little-Hitch-Snares-ENERGY-STAR-Homes
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