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PURGING
Interactive 1.2
VENTILATING
Interactive 1.3
When the manhole is first opened, maximum air flow should be introduced into the manhole as rapidly as possible for a minimum of 10 minutes. The blower hose should hang straight down, eliminating as many flow restrictions as possi- ble, as shown.
After entering the manhole, place the outlet portion of the blower hose in a horizontal position on a cable rack or along a side wall approximately midway between the floor or platform and the splicing chamber or vault roof.
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