Interior Vertical - Wall Exit - This installation requires a 4-inch pellet-vent pipe. No exceptions! If the exit termination is on an outside wall subject to high winds, then a high-wind termination cap must be used. Be sure to maintain 18 inches from the top of the cap to the underside of the eave.
** This information is generalized for use on all Thelin Pellet Heaters. Refer to your models installation and operating manual for information specific to your model.