Wanted to get some advice on the connections on the back of the stove and if they should have 3 screws at each connection? Right now I have the 3 inch adaptor connecting to the back of the stove flue outlet then I have the 3 - 4 inch T connected to the adapter and then a 4 inch adapter connecting to the 4 inch flex pipe. All connections have been sealed with heat rated silicone and I also have used some type of circular dryer connector that can be tightened with a screw driver. I did put 3 screws in at the top of the T to connect to the 4 inch adapter. I need to get this inspected by the building department so I would like to get it right before they come and check it out. Also is a blanking plate necessary to put in the throat of the chimney, right now I have some aluminum backing insulation shoved in between the spaces and the flex pipe. Thanks in advance.