The nose cone is attached to the leading end of the liner. It helps prevent snagging against the side of the stack during installation. Please note that draw cords are not supplied.
Insert a draw cord or string (not supplied) into the hole of the nose cone. Secure with a knot. make sure the draw cord is long enough to reach to the bottom of the stack. Now tape or secure the nose cone to the flue liner end.
Nose cone does what it says