I'm sure this has been posted on here somewhere. Just curious since I've read some posts that people have put in "I believe there are three different kinds of tubing". They also insulate it somehow. What is the point in insulating around your tube inside the masonry brick chimney? They also put a cap on the flues top. Does this greatly benefit those with cats? If I already have plenty of draft. Does it make your stove more efficient or is it unnecessary if you have plenty of draft already? I'd hate to have to blow another 500 or whatever it costs for more labor and materials on an already expensive stove.