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R403.5.5 Balanced and HRV/ERV Systems
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All balanced systems shall be balanced so that the air intake is within 10 percent of the exhaust output. A heat recovery ventilator (HRV) or energy recovery ventilator (ERV) shall meet either:
- The requirements of HVI Standard 920, 72 hours minus 13°F (-l0°C) cold weather test; or
- Certified by a registered professional engineer and installed per manufacturer's installation instructions.
An HRV or ERV intended to comply with both the continuous and total ventilation rate requirements shall meet the rated design capacity of the continuous ventilation rate specified in Section R403.5.3 under low capacity and meet the total ventilation rate specified in Section R403.5.2 under high capacity.
Exception: The balanced system and HRV/ERV system may include exhaust fans to meet the intermittent ventilation rate. Surface mounted fans shall have a maximum 1.0 sone per HVI Standard 915.
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