I just ran the liner down my chimney yesterday.  I am look at about 15 or 16 feet to the top of the insert.  The manual says 15 feet minimum.  It's in an interior chimney.  I wil not be insulating the liner.  I may insulate it next year.  Due to the nature of the top of my chimney,  I have the option of cutting this liner in several places at the top.  Is 15-16 feet enough or should I try to get it to 17-18?  Will there be much difference in how it drafts with an extra foot or two.
	
		
			
		
		
	
				
			 
	 
	 
 
		 
 
		 
 
		 
 
		 
 
		