Venting multiple tents

It'll make your furnace run more -- sending warm air outside. you have to worry about light pollution traveling through vents - not a problem if everything is on the same schedule but if you have some on 18/6 and others 12/12 that's going to be an issue of concern. Could have them all junction at a light trap that feed to the windor port or whatever. Have some baffles inside.. maybe black tape where the ducting where it hooks into port of tent to help reduce what leaves the tent, then a simple baffle light trap would do the rest. Better than looping all the ducting around to stop light and increasing static pressure immensely for the duct fans.. less resistance the way i suggest. The light trap box would also prevent light pollution from entering from the sun. -- preferably a window that doesn't face east or west, but even if it does the light box and other measures should be enough. can put a .. forgeting the word for it.. but liek for dryer exhuasts, they have slats/flaps of plastic angled down that help limit how much light would enter from outside. i drilled a hole into some ply wood, painted it, added a 6" molding and attached a duct.. squeezed into window with a dowel to hold it tight. used soem insulation and such arond it and boarded up window from inside, lol.... no light leaks and it was a nice clean port to the outside. It'll definitely help you control RH more easily. As long as you can avoid light pollution and it doens't cost you too much in extra heating (effects entire house), then it's a great idea... in the summer it's probably a no-brainer for RH control. fwiw, i stopped doing this. i only grow in winter now. the humidity from the plants can be balanced out more easily witha 30% ambient furnace-caused RH. I still need a dehmidifier after 5-7 weeks of growth. I need a humidifier for the first 4-5 weeks of growth, but thoats a low-wattage device by comparison. Reducing at 350w dehum saves money. a humidifier is just another 35w fan in the area, no big deal. The dehum also helps with ehat in winter... avoids needing an AC. I've got a rom dialed in to 75F / 50% in winter.. in the summer it's impossible to do. So, my suggestion - scale up and do larger grows in winter. it'll save money and avoid bud rot of high humidity summers (same in my region). the intial cost is higher, but the equipment lasts longer, too.. fewer hours per year put on lights etc... save money with economies of scale.. it'll cost less per gram produced almost guaranteed. Don't go too big.. 40-50sq ft is about all a "50pt" dehum can handle (new standard for measurement. old standard equates to "70pt") you need a heavy duty dehum in winter even with an ambeint 30% rh from furnace for anything more than 40-50 sq ft. Gotta step up storage game a bit with this strategy.. 2-way humidity control packs, 5-gallon buckets with gamma seals.. you don't want to be burping 100 jars. 3-4 buckets is easy.