Concentric vents make it easier to have a two-pipe installation for high efficiency furnaces. These vents simplify installation and only require one hole through the wall or roof where the pipes terminate. Without using these vents, the installation would require cutting two holes through the home, one for each pipe. These vents save time and money by reducing the amount of work required. These allow both the intake for combustion air and the exhaust vent to pass through a common roof or sidewall penetration. Available in 2in or 3in intake vent sizes.
