// CODE SNIPPET
K 106.4 Roof Washer or Pre-Filtration System
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The inlet to the roof washer shall be provided with a debris screen or other approved means that protects the roof washer from the intrusion of debris and vermin. Where the debris screen is installed, the debris screen shall be corrosion resistant and shall have openings not larger than 1/2 of an inch (12.7 mm).
Roof washing systems shall be provided with an automatic means of self-draining between rain events.