Positive Air Pressure Problems

Hi Guys,

I have had my tent set up for a couple of weeks now, I have an intake and extraction fan, and im using an SMS Twin Fan Controller.

Until today I always had negative air pressure, but today my tent has positive air pressure. Ive not altered the speed settings etc since beginning to use. I wondered if anyone could explain this and help me. I have since changed it so the extractor is working more at minimum to combat the intake, so far it doesnt seem to have done much... any help appreciated.

Thanks

by putting both fans as exhaust you will be better venting than if you had one intake and one exhaust

That and your exhaust should run faster than your supply if you want negative air pressure . By slowing your exhaust you are creating + air pressure.