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PDFWAC 51-52-1106

Section 1106—Machinery room, special requirements.

1106.4.2 Emergency ventilation system. An emergency ventilation system shall be provided at the minimum exhaust rate specified in ASHRAE 15 or Table 1106.4.2. Shutdown of the emergency ventilation system shall be by manual means.
Table 1106.4.2
MINIMUM EXHAUST RATES
Refrigerant
Q(m/sec)
Q(cfm)
R32
15.4
32,600
R143A
13.6
28,700
R444A
6.46
13,700
R444B
10.6
22,400
R445A
7.83
16,600
R446A
23.9
50,700
R447A
23.8
50,400
R451A
7.04
15,000
R451B
7.05
15,000
R1234yf
7.80
16,600
R1234ze(E)
5.92
12,600
[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-1106, filed 11/15/23, effective 3/16/24; WSR 20-03-041, § 51-52-1106, filed 1/8/20, effective 7/1/20.]