Do tents have too much neg pressure

[Jamesparks]

Seems like the tents are sucked in too much.
Have infinity T6 withdraw fan inside venting out top. I have open two 6” vents on bottom but with black fabric doubled or tripled to prevent light leakage. Tents are 48x24x72. Any suggestions much appreciated.

 

[3cats]

Seems like the tents are sucked in too much.
Have infinity T6 withdraw fan inside venting out top. I have open two 6” vents on bottom but with black fabric doubled or tripled to prevent light leakage. Tents are 48x24x72. Any suggestions much appreciated.

Turn down your exhaust speed. My tents don't suck in like that. I've a 6" in my 5x5 and a 4" in my 3x3. Add an input air fan. I input air from a cooler part of my house via duct to the bottoms with an air filter at both ends.

 

[ArtfulCodger]

Another approach you could try would be to cut out or fold the blackout curtains so they don't cover the vents, and make baffles to keep light out of the vents.

 

[Trash_2002]

Some negative pressure is good tho, it help to exchange air/co2 evenly.
Another workaround so you don't loose too much space on those 4x2 tents:

Grow Tent Mounting Bars, High Airflow CFM Kit, 2x4'

Your source to create smart growing systems with components including advance grow tents, inline fans, clip-on fans, LED grow lights, and UIS™ controllers.

acinfinity.com

 

[Zill]

If you’re a fastidious tent cleaner and have no widespread repeating bouts with mildew fungi a negative tent relative to the room could end up sucking in airborne spores into the tent. I know it’s not a classified room. Just saying…is the tent in a dry area or a damp basement?

 

[Jamesparks]

If you’re a fastidious tent cleaner and have no widespread repeating bouts with mildew fungi a negative tent relative to the room could end up sucking in airborne spores into the tent. I know it’s not a classified room. Just saying…is the tent in a dry area or a damp basement?

They are in a hall way. Dry area.

 

[Kamisama]

Some tents have a construction to prevent walls sucked too much in.
Secret jardin has a good connectors for it, so u can make this additional construction on your own, just buy a regular pipes and DIY proper lenght.

They have also a special stuff to make hole which also prevent light going in, more air in tent from outside can lower the negative pressure.

Or add a fan to get air from outside in but have it weaker than the one inside.

 

[Zill]

If you have negative tent air pressure and a single inlet you could use a HEPA filter. Buy the membrane but fabricate the frame if needed. Probably more trouble than needed. You’ll never be rid of spores. It’s a management thing.

 

[Jamesparks]

Could you use one of these in one of the bottom
vents to feed air to prevent the negative pressure? Only thing is how to I stop the light getting in?

 

[Kamisama]

Could you use one of these in one of the bottom
vents to feed air to prevent the negative pressure? Only thing is how to I stop the light getting in?

U can use a tube for air circulation and duct tape. Its usually used in almost every inline fan.

 

[Jamesparks]

Can u explain what you mean by a tube? I have 2 6” ducts coming into the tent on the bottom but not wide open. I put black fabric tripled on the ends of the duct to prevent light leaks. So this restricts airflow huge. So would that fan work?

 

[Kamisama]

Can u explain what you mean by a tube? I have 2 6” ducts coming into the tent on the bottom but not wide open. I put black fabric tripled on the ends of the duct to prevent light leaks. So this restricts airflow huge. So would that fan work?

I meant flex ducting.

 

[cannafarmer420]

Seems like the tents are sucked in too much.
Have infinity T6 withdraw fan inside venting out top. I have open two 6” vents on bottom but with black fabric doubled or tripled to prevent light leakage. Tents are 48x24x72. Any suggestions much appreciated.

Looks like a good seal to me, if it doesn't suck in your negative pressure is suspect. I've never had an issue.

 

[hoobastank_enthusiast]

Negative pressure isn't bad, it means you're moving air. I have a 2x2 ACI and notice the same thing if I jack my exhaust fan all the way up, but in that space the exhaust fan doesn't run above 1 unless it trips a substantially low VPD trigger. The exhaust fan shouldn't be the source of meaningful air movement, that's really the clip fan's job.

 

[LoveGrowingIt]

I use cardboard boxes to make light baffles to cover the intake vents. That usually means cutting the cardboard to fit. I leave an opening away from light sources. Sometimes I put them on the inside of the tent and sometimes I put them on the outside of the tent. I've thought about spray painting the inside with flat black paint, but so far haven't done it. It seems to work well.

 

[Jamesparks]

Ok thanks all. I just got off the phone with AC Infinity and besides buying 2 fans like my exhaust fan. Which would be expensive, he suggested the cheaper route. Put 2 6” duct tubing in on the bottom of each tent, which I have already, but instead of the heavy fabric at the inlets, to use black pantyhose which would give way more airflow. Wife don’t have any so it’s off to Target or Walmart to buy some for the other “ladies” in my life.