Outside Air Intake for my Harman P43

Hello,
I am curious about something. My outside air intake pipe is a flex pipe of sorts, one end connects to the thimble and the other to the stove of course. The pipe just slides inside each point of connection. Should this pipe be connected with a screw or something? Or is it normal that it just sits in there? Should I seal each end where it enters the thimble and stove? Here is a pic of the setup, the outside air intake is disconnected.

GrahamInVa said:

It would beneficial to put a pipe clamp on each end otherwise it could draw in some air from inside the home. Also, if the power went out you could get some smoke leaking from there. Sealer is not really needed but wouldn't hurt.

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Hi,
That's kinda what I thought. I can't put clamps on the pipe though because the pipe actually goes inside the outlet. The diameter of the pipe is actually smaller than the connections at the wall and on the stove. When I was cleaning out the back of the stove I saw a lot of dust, etc around the air intake so it made me think about the original setup. I think I may buy some larger diameter flex pipe from an auto parts store and get a couple of clamps too. That way I can tighten everything down.