Published On Mar 21, 2012
Check out the insane whirr this primary ventilation fan makes on start-up!
Notice the water coming out of the self closing one way doors on the fan and the doors on the smaller fans flapping open.
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Check out the insane whirr this primary ventilation fan makes on start-up!
Notice the water coming out of the self closing one way doors on the fan and the doors on the smaller fans flapping open.