60mm/100mm Diameter Stainless Steel Extension
This pipe fits our special sealed dual-chamber forced air intake tankless heaters. The exterior of the sealed dual-chamber stainless steel "flue" pipe system is for the arrival of intake or combustion air. The interior chamber is the forced air exhaust. With this advanced feature, the exterior surfaces of the flue are cooled by the incoming combustion airflow. In addition to a much cooler flue pipe exterior, the intake air is taken from outside the home. This method eliminates the potential for back draft of your furnace or gas dryer, as well as preventing escape of furnace supplied heating or air conditioning which can be drawn out of the home by tankless heaters which use "room-air combustion intake" designs.
This is the .5 meter (19.7") model.