Not sure how to put the storm collar on. Seemed like it would have been the simplest part of installing the chimney but I just can't understand how it goes on. I bought the supervent ceiling and roof kit and it came with a storm collar with a tab that was unbent on one end and then a tab the came off the bottom side of the other end. Any help would be MUCH appreciated as I need to finish the chimney piping tomorrow. Thanks in advance,