Hom Studio Ventilation

Hello everyone,

I'm will be building a home studio right now which is about 40 square meters. I've been doing some research on ventilation, but i haven't found the right answer to my questions. Letting a professional do the ventilation will be too costly for me. And i have found some examples of making a ventilation system yourself.

But i'm wondering if it is even necessary. Is it enough to have fresh air in my studio if i only aerate the room by opening windows and the door a couple times a day? I have two big windows which are 125cm by 90cm. By the way i'm a drummer. And i'm planning to make big acoustic panels that i can use to cover up the windows when i'm playing drums or rehearsing with a band.

Does anyone have an idea about how long your air in a room of that size is healthy when the windows and doors are closed?

Thanks!