When do I need a chimney extension?
Some of our clients want to place their hot tubs in a gazebo and lead the chimney through its roof. They will need a chimney extension for that. The extension is also useful if your tub is placed in a secluded area (next to big trees, in the corner between buildings/walls) where air circulation is poor. An extension helps to ensure good chimney draught. The chimney top should be at least three meters away from any flammable material, which is why sometimes it needs to be raised higher with an extension.
When installed, the standard chimney height reaches approx. 2.7 meters (106in) from the ground (measured at the cap top). A chimney extension will add 1 meter.