you didnt answer my questtion mate, this isnt choppers threrad lool
i read in a book as long as you can get fresh air in your room an extracter isnt necissarry its more for big projects that use a hole room that is say in the basement, as long as you can open a window for a bit and let fresh its all gd, and as a fan my mate is opening and closing his door every day for about 5 mins to change the air in the box doin a fan momentum