venting with aircool tubes

what would be the cheapest way to vent 4x1000 watt hps in cooltubes. could i somehow connect all 4 to one fan and vent them all like that? and tips would be very appreciated xD.

You COULD connect all 4 of them to one inline fan. I personally don't think it's a great idea. I would connect two 1kw per fan and probably use an 8" inline.

Connecting all four will cause a pretty large spike in heat by the time the air travels through the last light. I would do sets of two if possible. If not though, it could work for you. Just not as cool and efficient as it could be.