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Garage/Outbuilding venting solution

Hi guys,

I have a 7 x 4 meter outbuilding in garden being used as a gym. It needs ventilation due to high volume area, and I wish to prevent insects coming in.

Volume area = 67m3

Can I install two inline fans and mount them inside the ceiling, so as not to demolish my roof area which is small anyway (flat roof)

Maybe attach them to the ceiling with the pipes, one on either end of the room, one for intake, one for exhaust, and build an enclosure on on it to hold up the pipes etc?

Each fan can do 310m3 per hour, giving about 4.7 air changes an our.
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