negative air pressure

Okay so i recently got a primaklima 125(5 inch) one speed fan (360m3/h/211CFM) but i found out its way too loud when running at full speed so i got a RPM adjustor and insulated ducting and set it to 70% speed( should be around 250m3/h-150CFM now which is good noise-wise). Okay so now im running...

Hello friends pls help someone with expirience :) I'm doing cloeset grow : Light is SF2000 with 100mm Prima Klima extraction fan (280 m3/h) with speed controler and carbon filter, so my question is: *Can i put 120mm PC fan something like "Noctua" for my air intake will that be enough for...

I have three passive intakes on my tent, two 8in and one 6in. Problem is the tent's walls still get sucked in pretty hard and I don't feel like spending money on an intake fan. I suppose a fan controller could do the trick but are there work-arounds that would keep me from sacrificing air flow...