heat

:confused: can anyone give me advice . I have grown outside before and a few years ago i had an inside setup (not very successful ). I have a 400w hps light, 150mm exhaust fan, 150mm inlet fan. My growing area is a cupboard with the dimensions - 750mm wide ,600mm deep ,1600mm high. My concern is it may become to hot for my plants and a fire hazzard.
any suggestions?

The only thing I can think of is get a fan that would also bring air in from the outside along with the exhaust fan.

For an area that small you may wanna consider using a few flouros.A 400 watt HPS is too much light for your space.Is there no other place in your house for a grow room?A closet would be much better.