little help with my air exchange

my current setup is a 4x4 tent, 550w LED, 2 clip on oscillating fans, 1 floor fan and a 4 inch outtake fan.
I also have a large dehumidifier for flower.
I’m wondering how I can bring fresh air into the grow room while still keeping the rH in check? I usually just open the sliding door wide to allow fresh air intake but the rH outside is starting to get too high.
Could I possibly use another 4 inch intake fan to slowly bring fresh air into the grow area (not directly into the tent) while running the dehu simultaneously or will this not provide enough fresh air through the day?
The room is 3m x 3m attached to an another 3m x 2.5 m. So a large-ish area.

Hi there, the purpose of bringing fresh air to your grow room is to increase Co2 levels, that’s why growers with sealed rooms add co2 bottles or co2 generators.

It sound like you live in a house/Apt with central AC. the co2 ppm in my house runs around 700 - 1200 with a 50-60RH% 75f (family of 3,1666sq ft), I just bring fresh air/intake from my house and exhaust to outside and you should do something like that. If you exhaust to the same room with bigger plants, humidity will build up and making it a pita to control.
Just my 2 cents good luck and happy growing.

The rh rises when the air gets colder but it may be fine in the grow room From Google: As air temperature increases, air can hold more water molecules, and its relative humidity decreases. When temperatures drop, relative humidity increases.
Have you tried bringing the fresh air in and see how your RH is affected? I think cool high rh air will be fine in the warm grow room, but you should test it (and get other opinions)