Grow tent ventilation/exhaust help?

[outlier]

Yeah mate, a 250w is easy to cool. You can run one in a cooltube/hood with no fan as I just found. It stays cooler than the 600w with all fans a blazin'

Your intake will depend on how hot it gets inside your tent (how fast it needs the cooler air from outside). I found with my 250w hps, I needed 1 x 6" passive intake and the temps at the canopy were never more than 0.5c above room ambient. With my 600w I needed 2 x 6" vents open as the temps would climb to 5-6c above room ambient. With the two vents open, it was back to about the same as the 250w (slightly higher).

 

[Anon Emaus]

Tent temp is relative to the room it's within. Goal is to keep it as close to the room temp. More airflow, closer you can get. I can keep all 3 within 5 degrees of the room. The fans are not that loud at all imo. I just got the $60 ones on eBay. They work great. If you do upgrade to a 600w for example, get the kit with an air cooled hood.
Example of how I set them up.
View attachment 3612936

Sounds good, thanks for the pic. You use any brand specific carbon filter?
Sounds good, yeah i just had bought the 250w a few months ago without cool tube so that's why i'm trying not to spend more towards the light, I should have just gotten one when i first bought the lighting setup. But yeah anything bigger than this i'd def want a cooltube

 

[Anon Emaus]

Yeah mate, a 250w is easy to cool. You can run one in a cooltube/hood with no fan as I just found. It stays cooler than the 600w with all fans a blazin'

Your intake will depend on how hot it gets inside your tent (how fast it needs the cooler air from outside). I found with my 250w hps, I needed 1 x 6" passive intake and the temps at the canopy were never more than 0.5c above room ambient. With my 600w I needed 2 x 6" vents open as the temps would climb to 5-6c above room ambient. With the two vents open, it was back to about the same as the 250w (slightly higher).

Thanks! What size tent did/do you run the 250w in and what size fan were you exhausting with?

 

[outlier]

Thanks! What size tent did/do you run the 250w in and what size fan were you exhausting with?

I was in a 1x1x2m tent with a crappy 6" inline booster fan (260cfm) running at the lowest speed my speed controller allowed (30% I believe). I was using a hood and quickly removed the glass when I realised that the glass was always cool to touch. I was not filtering however but I probably could have easily with the 250w and the shitty booster fan. Definitely not with the 600w. I was at the absolute bounds of my setup with that baby. She can get very toasty

 

[Anon Emaus]

I was in a 1x1x2m tent with a crappy 6" inline booster fan (260cfm) running at the lowest speed my speed controller allowed (30% I believe). I was using a hood and quickly removed the glass when I realised that the glass was always cool to touch. I was not filtering however but I probably could have easily with the 250w and the shitty booster fan. Definitely not with the 600w. I was at the absolute bounds of my setup with that baby. She can get very toasty

Thats the exact size tent i'm looking to use, so thanks so much for the info! Seems like i should go with a fan around that 160-190cfm area and even get a speed controller for it just in case.

 

[outlier]

Thats the exact size tent i'm looking to use, so thanks so much for the info! Seems like i should go with a fan around that 160-190cfm area and even get a speed controller for it just in case.

No probs mate! You should even be okay with venting back into your room. I had back draft issues with the 250w as it was throwing cold air outside that was being sucked straight back in through the gaps in my aluminium slider windows. Had to plug the small gaps with some polyethylene foam to help stop it. Compared to the air coming from the 600w, the air from the 250w felt like it was straight out of the aircon

 

[twistedwords]

By yourself a Noctua 144 mm fan($22) that will move up to 100 CFM and dead silent. Plus since it is designed for PC's it will cost you about a dollar to run per year. Just go to home depot and get a adapter for your exhaust line 5 bucks.

 

[dtrip]

How does those PC-fans work with a scrubber?

Maybe it works if you add a fan blowing thru it?