Ventilation complications..... FAQ helps but still have more direction

Have a complicated situation requiring ventilation of 4' x 4' x 7' flowering tent lit up with 600 watt HID within utility room measuring 12' 8" x 9' 9" with ceiling 8' one end x 11' on other end giving roughly 1174 cubic feet including space within flowering tent. Room contains vegetative section using numerous CFL's but plan on getting a Bad Boy when bucks available. Room also contains gas boiler for sub flooring heat & hot water as well. Also gas dryer and washer occupy this space. Have 424 CFM 6" fan for exchanging stale air for fresh air with 6" carbon filter in tent. As you can imagine space is at a premium in this room but have 3 shelf riser to place veg. plants on which brings them close to same height depending on size. Currently door not installed but for safety when door installed 6" air inlet required and outlet to vent air outside to provide safety for any gas leak and also to provide garden with continuous fresh air. Carbon filter installed inside tent to filter out impurities, odor, microbes and fungi. My question is how to utilize fan to filter entire room and not draw in excess per will be required or fan will draw in enough cold air to have popcicle plants if not controlled properly! Hahahaha While still being able to keep door closed most of time. Have fan speed controller and one idea I have come up with is using a Y to split duct work and possibly a dampers of some sort to balance airflow going from tent and into room from outside vent. The fan & ductwork is 6" and other vents are available to draw air into tent and filter it there. If anyone has ideas and/or calculations to utilize for this project I would greatly appreciate any feedback. This is the first time I have attempted a project like this. Only have one nice plant budding at present but will soon have a tent full and would like to have house not smell quite so nice! Also it's time for privacy to my "utility" room! Hahahaha. Any ideas or calculations to remedy this situation would be greatly appreciated. I plan on making this main grow area for time being but relative mentioned running water line upstairs which would be expense but upstairs is wide open 14' x 24' area. Lot of work benches, guitars, amps, etc. reside up there but could have hell of a grow room/ tent up there if I went that way and have no boiler, etc. and also have windows as well. All my toys and grow area in one spot....what a dream come true! Hahahaha In meantime utility room is it. Also have privacy and this is key even though this is legal Medical M J grow. If you want to email me direct with info feel free. Peace,
Grizztone
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Thanks for reply. Situation is as such.....no attic, no windows, have large gas boiler which for safety needs vent to outside for safety when door closed. Door not installed as yet. Temps without fan & filter running ( just oscillating fans is in 80's when hot. Now it is cooling off and it gets -30F in winter here. Just got fan & filter and planning best way to ventilate whole room and tent. Thinking of louvered door to pull fresh air into room and vent to outside. Botanist at grow shop said 6" fan & filter would do the trick. Want to be able to close door for privacy. Vents going into tent should filter room. Hope this clears up some of explanation. Don't really want to have outside vent for passive input so considering the louvered door instead. Don't need a/c now as it's fall. Hope this helps some. Do have on other possible outlet. Do have drain on floor to setic tank to use as outlet. Can't think of anything else at present. Thanks greatly!

 

Hi,
Yeah that's with HID on but I just recently got fan & filter and am working out what would e best position to place filter. Tent is in far right rear corner of room....only spot where it will fit. My idea of using Y was to leave one part of Y open to room to draw in air from rest of room by venturi effect created by fan blowing into other side of Y and then this would be vented outside. That was why I thought of this solution with damper to create smaller opening thus creating greater negative pressure to open side of Y. Not plannig on hooking into boiler flue but thanks for tip on other post. I'll search for it. The more I deal with this I like my son in law's idea to move operation upstairs. He says he would run water pipe up from kitchen sink as hauling water as well as plants, soil,etc. upstairs would be a real bugger. But I can't even get him to finish my siding job I already paid him for! Hahahaha So when would H2O pipe be installed? 2018? Upstairs is 14' x 24' and is going to be music room, guitar workshop, wife's jewelry workshop, etc. but would be tons of room for growing but again....no privacy for grow area. The last issue of louvered door was to be method of drawing fresh air from house so outside inlet not needed to keep that sub-zero air out. Maybe all of my ideas are bunk but sooner or later something will click and work. Probably the most simple will be what wil work. Hahhahaha Hey...thanks for all your ideas and feedback! Appreciate it very much!