m0useanswered grow question 3 years ago If you are using an extractor fan you need a vent to help let air in.
I use Secret Jardin light proof air vents, They can be installed on any tent with poles and every without, but they would just hang there.
https://www.secretjardin.com/product-category/ventilation/
Their are also other options, it will extend your fans life and with a carbon filter attached it already has resistance no need to add more.
Good Luck!