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Garden Knowm Reviewed by Garden Knowm on . Basement with no intake airflow? Okay my question is this: How worse off will I be growing in a basement that will have no fresh air coming in from outdoors? The only thing it will have is the home's built in air conditioning unit. I'm going to have lots of fans from different angles for airflow. I'm going to have the exhuast going outdoors or to another part of the house. I can't think of size dimensions so I'll throw out 30 ft. by 40 ft. is the basement size. It's also going to be a fair amount of watts Rating: 5