# WAC 51-11C-40336: WAC 51-11C-40336. Section C403.3.6 — Ventilation for Group R-2 occupancy

> Washington · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_40336

## Section

- **Citation:** WAC 51-11C-40336
- **Heading:** WAC 51-11C-40336. Section C403.3.6 — Ventilation for Group R-2 occupancy
- **Jurisdiction:** Washington
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Washington Administrative Code / Title 51 / Chapter 51-11C / Section 51-11C-40336

## Text

C403.3.6 Ventilation for Group R-2 occupancy. For all Group R-2 dwelling and sleeping units, a balanced ventilation system with a heat recovery system shall provide outdoor air directly to all habitable spaces. The heat recovery system shall have a 60 percent minimum sensible recovery effectiveness as calculated in accordance with Section C403.3.5.1. The ventilation system shall allow for the design flow rates to be tested and verified at each habitable space as part of the commissioning process in accordance with Section C408.2.2.
EXCEPTION:
Heat recovery and energy recovery ventilators (H/ERV) that are rated and listed in accordance with HVI 920 can demonstrate compliance with the sensible recovery effectiveness requirement using the adjusted sensible recovery effectiveness (ASRE) rating of the equipment at 32°F test conditions. Applied flow rate for ASRE rating shall be no less than the design flow rate or the closest value interpolated between two listed flow rates.

## Nearby sections

- [WAC 51-11C-4037 WAC 51-11C-4037. Section C403.7 — Ventilation and exhaust systems](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_4037.md)
- [WAC 51-11C-4038 WAC 51-11C-4038. Section C403.8 — Fan and fan controls](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_4038.md)
- [WAC 51-11C-4039 WAC 51-11C-4039. Section C403.9 — Heat rejection and heat recovery equipment](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_4039.md)
- [WAC 51-11C-10100 WAC 51-11C-10100. Section C101 — Scope and general requirements](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10100.md)
- [WAC 51-11C-10140 WAC 51-11C-10140. Section C101.4 — Applicability](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10140.md)
- [WAC 51-11C-10150 WAC 51-11C-10150. Section C101.5 — Compliance](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10150.md)
- [WAC 51-11C-10200 WAC 51-11C-10200. Section C102 — Alternative materials, design and methods of construction and equipment](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10200.md)
- [WAC 51-11C-10300 WAC 51-11C-10300. Section C103 — Construction documents](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10300.md)
- [WAC 51-11C-10400 WAC 51-11C-10400. Section C104 — Fees](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10400.md)
- [WAC 51-11C-10500 WAC 51-11C-10500. Section C105 — Inspections](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10500.md)
- [WAC 51-11C-10600 WAC 51-11C-10600. Section C106 — Notice of approval](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10600.md)
- [WAC 51-11C-10700 WAC 51-11C-10700. Section C107 — Validity](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10700.md)
- [WAC 51-11C-10800 WAC 51-11C-10800. Section C108 — Referenced standards](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10800.md)
- [WAC 51-11C-10900 WAC 51-11C-10900. Section C109 — Stop work order](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_10900.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_11C_40336. Check the current official text before relying on it. Not legal advice.