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51-11C-403249  <<  51-11C-40325 >>   51-11C-403251

PDFWAC 51-11C-40325

Section C403.2.6Ventilation.

C403.2.6 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, economizer, night flushing, dehumidification, pressurization, exhaust make-up, or other process air delivery. Outdoor air shall be reduced to the minimum ventilation rates when not required for the preceding uses.
 
2. Air systems supplying Group R-1, R-2 or I-2 occupancies.
 
3. Alterations that replace less than half of the total heating and cooling capacity of the system.
 
4. Systems with energy recovery complying with the requirements of Section C403.5.1.
[Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-40325, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40325, filed 2/1/13, effective 7/1/13.]
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