Harman Adapter Increaser - 3"/4" dia.

Ideal expanding vent size, this adapter is tailored for use with Harman Pellet Stoves. PelletVent Pro offers a reliable venting solution for appliances that burn wood pellets, oil, and a wide range of biofuels—including corn, cherry pits, wheat, sunflower hulls, and more. Built to handle continuous flue temperatures up to 570°F, it’s a durable and versatile system made for modern multi-fuel heating needs.