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Yes, you need a damper. If you don't install one, your stove will go through wood like crazy and will always burn extremely hot. This also allows you to close it when not in use preventing natural convection from venting the heat in your house up the chimney.When installing the pipe, ensure the female end of the pipe is up. This prevents the tar and condensed soot from leaking out on the floor and stove. This way it will drain back down the pipe and back into the stoves burn chamber.
I disagree about the damper. Airtight wood stoves have an intake air adjustment, that is what you want to use to adjust how fast the fire burns and to push to all closed when no fire. A damper is on the output air, you dont need or want this as you do not want to obstruct the smoke getting out for a wood stove.