The Harvia WHP1000M Chimney Extension is a 1-meter (39 5/8") insulated chimney pipe designed to extend the height of your Harvia chimney system. Constructed from durable black steel, this chimney extension seamlessly pairs with the WHP1500M Chimney Kit, ensuring safe and efficient venting of smoke from wood-burning sauna stoves. The insulated design helps maintain proper chimney temperatures, preventing heat loss and optimizing the performance of your sauna heater.