halides in a canopy

Heres the deal... I am having a custom canopy being made where Im going to be canibalizing my fixture which contains 2 250w mh's and 2 96 w PC's.

My concern is airflow in the canopy. Reefsparky will be helping me power my fans but I need to know what is the best way to have fans set up?
Should I have an opening in the back?

I was thinking of having a fan on each right and left side blowing air into canopy. Then Having 2 fans directly in between the halides blowing air upwards and out. So it would act as an exhaust. not decided on open or closed back. This is where you come into play.

What do you think I should do?

Any insight on a project like this would be great.

 

Having dealt a lot with airflow myself it's best to draw air in across the fixture from one side only. So, I would recommend having a vent on one side, fans on the other side blowing out. Blowing into the center from both sides will likely create a hotspot in the middle. Having the cool air pulled in one side and hot exhausted out the other is best.

 

even if I had fans directly between the halides exhausting up wards? and what about open or closed in the back?

 

+1

Having outtake fans only will create negative pressure as well, this will help with dust and dirt build up as well.
(Positive pressure opinion based on my experience in the IT field)

 

The idea is to draw cool air from outside the fixture, have it pass over the halide fixtures and then exhaust it via a fan. You wouldn't want it where somehow airflow is making its way around or not even over the halides thus resulting in an overheating situation. When it comes to airflow, simpler is better. Basically, draw a line from the input grate to the exhaust fan - it should be as straight a line as possible with the light in the middle somewhere. If you were to have fans in the middle exhausting up, I would recommend openings on the left and right hand sides of the fixture to draw air in.

 

Exactly where I'm drawing from as well

 

If the back remains open I would say one on each side is fine, however, I might stagger them (one toward the front more and the other toward the back).

 

In my canopy, I have one fan blowing in and one blowing out. 2 fans, one on each end

 

While I'm sure this creates more flow then just one exhaust fan, the only issue i see with that is it would create a neutral air pressure allow dust and dirt to build (Unless your exhaust fan has a higher CFM rating then your intake fan)