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IECC and ERV requirements

H

Henchalwoog

Member
Joined
Nov 6, 2009
Messages
10
I am struggling with the ERV requirements listed in the IECC table C403.2.6 (2012) - based on our climate (5A) it would appear to prohibit 100% outside air systems such as an exhaust fan and louver setup...however it WOULD NOT prohibit a fan system that runs at 50% of the required air flow and under 3500 cfm...so I take that as meaning if I have to exhaust 2000 cfm I cannot do it with 1 2000 cfm fan (100% of design airflow requirement) but if I split it into 2 fans (1000 cfm each) and louvers I can do it? That does not make sense of course but the exceptions to this section also indicate an ERV is required if there is a single source exhaust that is less than 75% of the design outdoor airflow rate which would support that idea.
 
The amount of the exhaust is not 100% of the space - the fan is sized for the amount of exhaust air (2000 cfm) but being as there is only 1 fan then 100% of the exhaust is through the location...thereby the design airflow into the space is 2000 cfm correct?
 
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