This 3" single walled Z-Flex Vertical vent kit is for vertical installations of the Eccotemp 40HI (indoor models). You will need to purchase additional Z-Vent straight pipe. You will need to determine how many additional feet as well as need a condensation drain. Also remember A max vent run of 20 FT. subtracting 4 Ft. for every 90 Degree elbow in the run.
Z-Vent special gas vent kits are all made of AL-294C stainless steel and are category II/III and UL compliant.