I have a 3 x 3 x 6 tent and a 4 x 4 x 7 tent next to each other in a room with a window closest to the 3x3 tent. The 6” fan and carbon filter are in the 4 x 4 tent and the 4” fan and carbon filter are in the 3 x 3 tent. Materials: Vent works window dryer vent Hydro farm 4x4x4 ducting wye 4” flex ducting 4” vivosun inline fan with vivosun carbon filter 6” ac infinity s6 inline fan with G Hydro carbon filter Does this diagram seem to make sense with my airflow and exhausting my high temp air to the external environment?
can you do a 6" Y, and 6" for the 16' run? What lights? if your doing LEDs, ur diagram should work pretty good
I’d have to get a different eye and multiple 6 to 4” reducers. If I really had to I would. But it cost money. I figured 4” on both ducting lines might help keep flow steady and not overpowered on one fan over the other. I’m growing HLG Quantum boards LED in both tents 335 w total in 3x3 480 w in 4 x4
I could do 6” for the ducting from the 4x4 that has the 6” fan. But would need another 6 to 4” reducer to connect to the 4” wye I have now Aside from spending more and more money. Do you think this will work ok?
you should be ok with that setup using those lights.. as long as you can hold neg air pressure you shouldn't get any smell outside either some heat will escape into the room the tents are in so it will get warm in there
I plan on leaving the door to the room open in this case so air from within the house can come in. I guess we’ll try it...
THatll work. as long as it doesnt get extremely hot in there. One great thing about Quantum boards is that using those lights the plants can do perfectly fine at temps around 88. I recommend keeping the drivers on outside of tent
Like where your heads at! Haha get rid of that hot air! I think it's a good idea, I'm just wondering about reduction in cross sectional area that the air has to flow through. With (2) 6in exhaust fans you're flowing ~800cfm through ~56in2, and when you get to the wye your total cross sectional area drops to ~12.5in2. That's 4.5× less room, for that air to travel through, so I'm thinking your air flow rate will drop. This large reduction in cross sectional area might cancel out any positive effects you'd see by venting outside, if its venting capacity were reduced too much. In reality a 6in diameter line has over 2× the cross sectional area that a 4in diameter line has (despite the 6in diameter only being 50% larger than the 4in). If this type of system were to be successful I think you'd have to at least give each 6in line its own 4in vent hole. You'd still be 2.25× less cross sectional area, but it could be worse lol. If the fans keep up their rated flow rate you'll just end up having more exhaust pressure. There will be a trade off in total cfm vs crossectional area and duct drag (length and bumpiness of the inside of the duct, flex ducting reduces cfm more than straight ducting, thus why your stationary ducts in your house have smooth insides, but sometimes you're limited and you just have to use flex ducting). Im not sure how you're venting now, but you could throw a 6in to 4in reducer on the end of one of your lines to get an idea of cfm loss or noticeable change in temp with the reduction or without. You could even cut your own holes and window face plates out of some wood. Then you could cut 6in holes. You'd perhaps reduce your overhead cost without having to buy as much specialized ducting etc, and you'd garuntee an easier time of flowing your heat out. I think home depot or stores like that will carry 6in "duct collars" and I think what you'd be after. Here's a quick pic I pulled off Google, but didn't search hard to find good prices otherwise I'd post a link with a cheap price lol (1) 4in vent hole may be large enough when it's all said and done. I honestly don't know, but I'd assume there'd be a performance drop. I'd assume it'd be great enough that you'd want at least (2) 4in holes, and maybe probably even more area than what that would provide. (1) 6in hole is bigger than (2) 4in holes. If you're going to end up reducing area, perhaps (1) 6in hole would be cheaper and easier to try to deal with than (2) 4in holes. Pretty much letting the cross sectional area guide me on my opinions. Good luck! EDIT: I missed that you had (1) 4in & (1) 6in, I thought they were both 6in fans. That helps. You'd still be reducing your 6in line by over 2× its original size as well as flowing all the air through 3.25× less area. I put a carbon filter in each tent exhausting straight into the room, and then I put another carbon filter in the tent room exhausting outside (actually exhausting through a floor register to the rest of the house). This way each tent gets fresh air pulled in and circulated locally, and the tents dump non smelly filtered air into the grow room which is then filtered again before sending it away. Maybe overkill but it's just what I do. The rate you send the air away will also be the rate that the new "cooler" in temp air replaces it. If you've unobstructed pathways for exhaust and intake then your cfm will be greater. So if you vent out the window make sure you have the floor register vents open, or the room door open so that theres a way to replace the air. Otherwise its like sucking on a straw with your finger plugging the other end.