Quote:
Originally Posted by jimbo_jim
U don't need both vents extracting. U just need the 1 at the top. Heat produced from the light will rise creating convection currents so all you need is the top vent and it will vent out the hot air that is riseing upwards. Have a vent at the bottom venting in to the grow room as this will be cooler air that will stay near the bottom until heated when it will rise upwards
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Jimbo,
I've got a glass enclosed reflector so the lamp air is isolated and is vented out. So i'll need another exhaust for the ambient air. I got a 4" exhaust fan last night and will probably put it in the middle of the closet....perhaps you recommend it goes on top too? Then I'll have a regular fan blowing air from the outside and on the plants.
Here's a little sketch:
plan.JPG