Wash. Admin. Code § 51-11C-40322 - Section C403.2.2-Ventilation and exhaust

C403.2.2 Ventilation and exhaust.
C403.2.2.1 Ventilation. Ventilation, either natural or mechanical, shall be provided in accordance with Chapter 4 of the International Mechanical Code. Where mechanical ventilation is provided, the system shall be configured to provide no greater than 150 percent of the minimum outdoor air required by Chapter 4 of the International Mechanical Code or other applicable code or standard, whichever is greater.

EXCEPTIONS:

1. The mechanical system may supply outdoor air at rates higher than the limit above when it is used for particulate or VOC dilution, economizing or night flushing, dehumidification, pressurization, exhaust make-up, or other process air delivery. Outdoor air shalthe minimum ventilation rates when not required for the preceding uses.

2. Air systems supplying dwelling or sleeping units within Group R-1, R-2 or I-2 occupancies.

3. Alterations that replaceg and cooling capacity of the system.

4. Systems with energy recovery complying with the requirements of Section C403.7.6.1 that utilize sensible only active chilled beams for space cooling without any additional zonal fan power. Active chilled beams shall be permitted to utilize the increased outdoor airflow to increase space sensible capacity and to maintain space latent cooling loads without additional controls to reduce the outdoor airflow to each zone.

5. Systems that include energy recovery ventilation with an 80 percent minimum sensible recovery effectiveness in accordance witha
C403.2.2.2 Exhaust. Exhaust shall be provided in accordance with Chapters 4 and 5 of the International Mechanical Code. Where exhaust is provided, the system shall be configured to provide no greater than 150 percent of the minimum exhaust air required by Chapters 4 and 5 of the International Mechanical Code or other applicable code or standard, whichever is greater.

EXCEPTIONS:

1. The mechanical system may exhaust air at rates higher than the limit above when it is used for particulate or VOC dilution, economizer, night flushing, dehumidification, pressure equalization, relief, or other process exhaust air requirements. Outdoor air and exhaust air shall be reduced to the minimum ventilation rates when not required for the preceding uses.

2. Domestic range hood exhaust in Group R occupancies.

3. Exhaust from Group I occupancies.

Notes

Wash. Admin. Code § 51-11C-40322
Amended by WSR 16-03-072, Filed 1/19/2016, effective 7/1/2016 Amended by WSR 19-24-040, Filed 11/26/2019, effective 7/1/2020 Amended by WSR 22-14-091, Filed 7/1/2022, effective 7/1/2023

Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. 13-04-056, § 51-11C-40322, filed 2/1/13, effective 7/1/13.

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