I just ordered a Jardin 4'4' as well. I would recommend you reconsider your fans and ducting. I'll be using a 600W HPS bulb in a sealed air cool hood and I'll run mine like this....
The Jardin has two vents about 2/3's up the side of tent on opposite sides. These are for hood cooling. You run a duct from left side of tent to hood, then run duct from right side of hood to an inline fan, and from the fan to the other vent outlet in the side of the tent. This keeps the light cooler, because fresh air is being drawn from outter room, through the hood and back out again, without ever mixing with the tent's air. This will cool the light and the tent by several degrees. Your strongest fan should be ducted to exhaust out of top of Jardin. The intake should be attached to your carbon scrubber. This way, all air that has odor atoms has to pass through the scrubber and can then be ducted outside or into an attic. Two passive vents at ground level should be left open and light proofed.
You can pull the tent air through the scrubber, then the hood and then through fan and into exhaust, but consider this; you'll be using hot grow room air to attempt to cool the bulb, and you are asking the fan to pull through a filter and a hood with some curved duct. That is alot of restriction. I think your tent will run hotter that way.