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Tips:5¢ Advice:Free
Join Date: Aug-2001
Location: Silicon Valley
Country: USA
Posts: 9,745
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The fans can be used to circulate within, or to exchange air with the outside. Vents will open to the outside, usually in pairs, with one on the roof and another near the floor. Greenhouses can provide elevated or more stable temperatures and/or higher humidity environments to accelerate plant growth or to extend the growing season or to promote plant propagation.
If you need to increase humidity, there are options like mist, water basins and evaporative cooling devices to do that. If you're watering in there periodically, you'll probably get a big humidity rise from moisture seeping into the turf, bark, gravel or cement floor and being released back into the air.
Regards,
Matt
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