those household bathroom fans just simply arent up to the job, they are only meant to run for a fraction of each day wired up to a thermostat humidistat or a light switch, not designed for 24/7 use, even the best branded household fans wil pretty soon fail under under 24/7 use. Why scrimp on your grow? Why not pay the extra initial outlay for made for purpose fans/filters and have the peace of mind that yr fan isnt gona fail in yr absence and u come home to dead plants, and know that yr smell is going to be dealt with properly! Your plants are yr babies man and u should be giving them the best possible environment for them to grow in and what you spend at the start wil be reaped back in yr first if not second harvest when u have everything dialled!
yes mate i run a 600w hps in a cooltube using only 1 fan/filter to cool my lamp and vent my room, was told it wouldnt work, but it does, temps rarely go above 26 degrees c, and when i zip myself into the tent i can feel plenty of fresh cool air being drawn in from the passive intakes. As long as you keep yr ductwork as short as possible, keep any bends or turns in the duct minimal. and use insulated/sound proof/sonoduct ducting after the cooltube because standard duct can get quite warm from the heat being blown thru the tube and without the insulated duct it will heat yr room further. Heres my c/filter/fan/cooltube setup.
This Really depends on the size of room, how many lights. Cooltubes are great because they have minimal airflow restrictions. I wouldnt recommend this for everyone, But if you can make it work for you than go for it.
just answering a question based on an assumption as no specific specifications or dimensions were stated that he would be using one light in the average cupboard/closet sized grow, of course it does depend on room size and number of lamps used but its still possible with more than 1 lamp in a larger room, just by using larger fans filters and ducting with duct reducers at each cooltube site. The growshops always say this isnt possible coz they want u to buy two fans and two lots of ducting and so many people get sucked in by this thinking they MUST have two fans, but me being a shepered and not the sheep i said fuck you mr growshop salesman and did it anyway and it works fine summer and winter and i know its now common practice to run cooltubes in this configuration
Awesome thanks for the pics bro, you gave me some ideas as far as the configuration of the exhaust set up. Is that an 8" inline fan you got there?
ok so you u have two equal sized rooms for veg and flower, to light both those rooms ideally you'd need 2x600w halides for veg and 2x600w hps for bloom, how come u only got 6' ceiling height with those sized rooms? I personally would keep the rooms intakes and exhausts independent of eachother, because the already heated air from yr veg room will cause you problems in yr flower room(drawing already warm air through yr cooltubes will greatly reduce their efficiency) that inline fan i use is 5" and pulls 240 cubic metres per hour, but my bloom tent is only 1.2x1.2x2m il let u do the math to convert that to cfm lol. id put yr 2 hps in cooltubes inline with maybe 3' of duct inbetween the two tubes then use the same configuration as me with fan and filter mounted to the top of yr room in the middle of the ceiling, blowing down to the cooltubes then out the room, and the same with the veg room using the halides, but id use a minimum of an 8" inline fan/filter/ducting for each room with duct reducers at cooltube sites, maybe even 10" because of the larger room sizes and two cooltubes per room. Ensure both rooms are sealed and airtight apart from yr passive intakes to ensure air is only being drawn thru the passives low down in the room and drawn over/thru the plants before it reaches the filter/fan. It is possible to extract/filter air from two rooms using one fan/filter but i wouldnt do it with the cooltubes, by using large passives in veg room then light baffled vents or ducts between the two rooms then use the biggest extract fan/filter/duct you can get on the outside of flower room sucking air thru both rooms and filtering by blowing thru the filter instead of sucking thru.
did u read any of the above posts? home made filters only last 2-3weeks if they work at all, without knowing the airflow rates(how much air can flow freely thru the filter before the filter creates too much resistance, and u need specialist airflow meters and pressure testers to find this out) of yr homemade filter it is impossible to match it with a fan, and using cat litter will not work at all! Cat litter is made to absorb large volumes of liquid over a relatively long period(a few seconds to absorb liquid is a long period of time) not made to trap microscopic odour particles from the air while being drawn thru the filter at a high rate via the fan. The only thing that works is pure virgin activated carbon designed for air filtration, not the type for water/aquarium filtration. Go to a growshop or order online a 4" inline fan/filter combo, that will be fine for yr drobe, and get a large box/bag of activated carbon online and refil yr filter every 12-18months or when the carbon is saturated and no longer works that wil save u some money, i think its the 3mm pelleted activated carbon thats used in most filters and works the best and widely available online. And how exactly do yr ferrets fit into the equation?
i have seen many homemade filters made by friends of mine that simply dont work, u stated that u planned on using silica based cat litter, i can assure u this will not work, anyway u do whatever u wana do, and if u dont wana hear other peoples opinions then dont post yr questions on a public forum, and i really dont understand why people insist on being a skinflint and making their own stuff, things like building yr own hydro systems etc fair enough, but things like lighting extraction and filtration imo cannot be compromised on, i mean the amount of money growing yr own will save you, you can buy these things 10times over, instead of making yr own substandard shit.
ozone can be very harmful to health, dont use one unless yr grow is away from where u live. For 2-3 plants extraction via a carbon filter will be fine.
