You have a few options for venting a pellet stove. Pellet stoves require type “L” vent pipe. Most will have a 4” vent pipe requirement. L-vent uses an air space between a stainless steel inner pipe and a galvanized outer pipe. Since the exhaust on pellet equipment is pressurized, all joints between pipe components must be siliconed or have a gasketed/sealed connection.
Pellet stoves can be vented vertically through the roof or horizontally through a side wall. It’s always a good idea to get some vertical rise with the L-vent pipe, before venting horizontally through a side wall. With rise in the vent profile, if power is interrupted while the stove is operating, there will be a natural draft established to remove the smoke and combustion by-products from the stove. This vertical rise can be achieved inside before the vent pipe is exited through the sidewall, or outside if you prefer an installation with no pipe showing inside. Inside or out, usually 3 or 4 feet of rise is sufficient.
If you plan to replace a wood burning stove with a pellet model, another venting option is to use the existing chimney for the wood stove. Rigid L-vent pipe can be installed to the chimney, special adapters will allow a 4” stainless steel, flexible pipe to be installed up the chimney. Your dealer can help you evaluate your best venting option.
Never use PVC pipe, gas vent pipe, dryer vent pipe or single wall black stove pipe to vent your pellet stove.