How many CFM's for 1000w HPS light with cooltube + carbon filter

I've been searching the forms for the last 2 days can cant seem to find an answer.

I'm growing in a 2X4X8 closet and am looking to put in a 1000w HPS light and a carbon filter. Because of the small space i would need to put the carbon filter and inline fan above the light and "U" it under with ducting to cool the light. It would then travel back up to be vented into the attic. Im worried about the 180 degree bend + the 45 degree bend killing all the pressure and not allowing enough cooling.

Any idea's if this would work.

And BTW this is what im looking to add in the closet.

http://tiny.cc/fofdj - inline fan + carbon filter

http://tiny.cc/qnfci - 6" cool tube and light

no one has any idea?

there is such a thing as too much light. you might want to re-consider your light choice. a 1000 watt light would give you 18,000 lumens per square foot. that is almost double the light of the sun and much more light than a plant can stand. even a 600 watt light is pushing the boundary with 12,000 lumens per square foot.

that fan is 424cfm, i would think that would be enough but im not an expert on cooling. if your gonna order those id go with ordering them straight from htgsupply rather then from their ebay store. htgsupply.com

i missed your room size first time round. in a 2x4 space id probably go with a 400

http://htgsupply.com/viewproduct.asp?productID=54182
235 with 6" cool tube.