Diversitech 4 inch connection horizontal or vertical concentric vent

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Concentric Vents 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 t he 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. Available in 2in, 3in or 4in intake vent sizes. Show more