Double chimney inner diameter 125mm, outer diameter 175mm Rain cap for strong winds (chimney top) 300 degrees heat resistant paint
Below is a common product description for the insulated double chimney.
Double chimney seamless welded pipe with 25mm thick ceramic fiber insulation
It is a connection method by socket connection.
The inner tube is 0.5 mm thick SUS316 and the outer tube is 0.5 mm thick SUS304 with excellent acid and corrosion resistance.
Connections are generally made by tightening with a locking band.
It is also possible to connect with screws without using a locking band.
As for the direction of the double chimney, the corrugated side on the outside of the double chimney is male and faces upward.
The female covers the outside of it and faces downward, preventing rainwater from entering the inside.
There are 3 screw holes in the female of the double tube, and those are facing downward.
If you turn it upside down, rainwater will enter from the outside, so be careful.
The inner single tube is the opposite of the outer double tube, and it is an insertion method called reverse insertion.
The female is facing up and the male is facing down, so there is no tar leakage.
There are 3 screw holes in the single tube female, and that side faces upward.
All single tubes will be this reverse stabbing method.