Fresh air into grow room?

So should I just not worry about it at all? As long as I have a fan going for air circulation on my plants?
 
I do feel like I'm lacking fresh air though. Windows boarded up so no-one can break in. i feel the basement is sealed pretty darn good and I don't feel any draft at all down there, I don't know how fresh air is coming in without an intake? I have a portable heater also for winter. I might need to get a humidifier too this winter cuz humidity drops like crazy in my basement once winter hits.
get ya self a small ul listed unvented gas heater 75 bucks at lowes an a dehuey u will be golden
 
get ya self a small ul listed unvented gas heater 75 bucks at lowes an a dehuey u will be golden
I have 3 dehumidifiers to drop rh as low as possible if needed during flower. Might need a humidifier though in winter when humidity decreases
 
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