This chimney set will work with most brands of Sauna Heaters including Leisurecraft, Narvi, Huum and Harvia. The outlet size is made for 115mm diameter so if you want to install with a Narvi heater you need to purchase the adaptor. Most other heaters comes with a 115mm outlet size.
The Chimney is 8" Outside diameter which allows for 1-3/4" of insulation around the outside.