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When Is an Erv Required?

Alexander Ross • • 6 min read
When Is an Erv Required?

Additionally, ASHRAE 90.1 currently requires ERVs on systems that bring in 70 percent outside air if the system is larger than 5,000 CFM.

Do I need an ERV?

For indoor air quality, an ERV is the best choice.

A whole-house dehumidifier with fresh air is still an excellent indoor air quality upgrade. ... An ERV doesn't need to. While the ERV contains a fan that's less powerful than your HVAC fan, it's still powerful enough to ventilate your entire home.

Are ERV required by code?

Since by its nature a DOAS is a 100% outside air system, an ERV is almost always required under the energy code.

Alexander Ross
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Alexander Ross

Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.