I'm not sure about the CFM issue. I'm doing ALL the tank related stuff (tub and venting) after my basement is 'done' and approved by the city. 
 
Makes me wonder...if I add this stuff on later and there was a fire...they find abs drain pipe, laundry tun and a venting fan not in my plans...am i no further ahead with the insurance company? maybe i still would not be covered? 
 
How many gallons are you planning on? 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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