In one tent is an aircooled hood that I'm currently running with no ducts attached. There is a digital remote Xtrasun ballast that will run 250W, 400w, 430, and 600W HPS and MH bulbs. Currently I'm trying a 400w HPS. Just to see any differences. I usually use 600hps.
So in the 600w tent I have a AC Infinity Cloudline T6 that ducts up thru the hole in the tent ceiling.
I also now have another 3' x 3' tent with a 315w cmh. Sunsystems non aircooled hood with vertical bulb. With a remote ballast by Prism Lighting Science. Currently being exhausted by a cheap inline 8" duct booster from Lowe's. Waiting on the money for another Ac infinity. The 6" is kinda Overkill but it has manual speed control as well as auto speed control settings for temp and humidity. I also opted for the bigger cfm fans so that I could add carbon filters and mufflers and still have sufficient air flow.
Eventually I will have a small carbon filter in each tent and place the fan(with mufflers on each side) in the middle of the duct runs. The ducts go thru tent ceiling, thru bedroom ceiling and across the attic and back down to a 6" x 12" vent on the other side of the bedroom. Directly under the two vents is my big daddy Phat filter that scrubs and exhaust downstairs. I may box those vents and filter one day. A sorta diy inline filter.
In the bedroom I have a window banger AC unit keeping the room cool.
A 420ish cfm Fantec inline fan, AC Infinity muffler and Phat carbon filter is in the bedroom to scrub all the stank out, now that I have more than one bloom area.
The 2' long Phat filter (need to change the dust pre-filter this week) is up against the ceiling, anchored to the wall with an old fan hanging bracket. The top of the filter is secured to the wall with a ratchet strap hooked to an eye hook.
Connected to the 6" flange on the filter is a 6" AC Infinity Muffler that slides over the Fan on its opposite end. To the bottom of the muffler is a 6" insulated duct that goes thru the bedroom floor to a vent in my living room downstairs. This helps cool the bedroom, and heat the living room. (Also stirs up all the bong hit smoke in the living room.)
I have just enough space between fan and floor to add one more muffler to the exhaust side of the fan. That will make the tv easier to hear downstairs.