“I used this on my AO Smith tankless hot water heater. Great quality, good price. One tip - the instructions tell you do bore a 5" hole through the home, but I went with 4.5" instead and, while it's a very tight fit, it's a much cleaner install than having to fill 1/2" gap around the pipe and your exterior sheathing.”
“The "buy used" one i received had one broken fin, during the install the top of torpedo fell on the porch and the second fin broke resulting in uneven hold on the outer pipe, looked crooked and un-sturdy.The second used one i received was perfect.The center pipe is the exhaust vent connected by 3" sch 80 PVC and air intake is the outer pipe connected by flexible 25' duct pipe. The flex pipe for air intake was a good idea due to limited space so it allowed some flexibility in the installation.”
“Y'd two 2" outlets from furnace & tankless into center then same procedure for intakes into the side. The 2" pvc pipes and 3" Y's are weighty so need to support from roof trusses if you do as I did. Needs some support no matter. (FYI 3" area of circle is greater than two 2" areas combined by about 3/4 s.i. so should be doable)”
