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I think I've got it under control now. Thanks for the responses guys

So after keeping a second vent open, the temperature increased by 5 degrees C. What does that mean?

Thanks for the reply. I should have mentioned that it's an autoflower and lights will be off for 4 hours a night Yeah, I was also worried that the fan would slow down during lights off due to temp dropping. So lose the temp sensor and run the fan at full blast? It's still in veg so no smell yet.

Hello there. First time grower so everything is worrying me I'm using a 70x70x160cm grow tent My inline exhaust fan is a 4 inch systemair rvk with 4 inch rhino pro carbon filter 250w MH/HPS lights Fan speed controller with temp sensor 6inch circulation fan at the bottom using passive...