% difference between inlet and outlet

Is there a recommended % difference in the inlet and outlet fans or dose it have to be dialled in specific to the room/ situation?

thanks

AnnFrank said:

Is there a recommended % difference in the inlet and outlet fans or dose it have to be dialled in specific to the room/ situation?

thanks

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Depends what you mean, do you mean air movement fans, or ventilation fans?

I think she's talking about exchange.

I don't force air in with a fan. I just oversize 1 fan for for each tents exhaust and let that create a vacuum. As it blows air out the tent and thru the filter the tent has 2 draw air back in. If your tent walls are sucking in your on the right path.

Electricity is more expensive than ever I try not to run extra stuff unless it's truly necessary. I also felt like I lost efficiency of inline filters with a intake fan. It's just to much air going everywhere causing more to make it out of the tent without being scrubbed.

If you insisted on adding a intake fan I would just buy a 6 or 8 inch desk fan and get it in your intake hole. Don't go inline and force that much air in and make your tent leak stinky air.

If I use a 6in exhaust fan. I’ll run two passive 6in intakes without fans.

Joe.Grow said:

If I use a 6in exhaust fan. I’ll run two passive 6in intakes without fans.

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Exactly the way to do it. Twice as much inlet area as exhaust. If a bit of negative pressure is needed put furnace filters over the intakes to get that. Should have fine filters over them in any case to keep nasties out. Triple layer of cheesecloth works well.

I got a peace of stocking on the intake and just outtake with carbon filter.got some mini fans for inside but negative pressure works well.