I have a 12’ ×15’ room with access panel to attic, I pulled panel and right above it in roof is a ventilation vent. I would like to run an exhaust fan to it. I have central heat and air in the room as well. I want to utilize all the space and need to know the proper amount of lighting and ventilation as well. Also, fresh air intake? C02? Cheapest way out without cutting back on what’s required for optimum product.