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Match the pipe to your wood stove's flue collar, which is 6 inches on most modern stoves and 8 inches on larger or older ones. Never size up to "help the draft" (a wider pipe actually weakens it), and never go smaller than the collar.

 Go through the roof when you have a clear vertical path above the stove, because a straight run gives the strongest draft. Go through the wall when the ceiling is cathedral or vaulted, the attic is blocked, or cutting the roof is off the table. Both are equally safe with Class A pipe at 2-inch clearance and the 3-2-10 height rule.

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The short answer: pellet stoves use a dedicated pellet vent system, called Type L vent or PL vent, listed to UL 641. It's a smaller diameter (typically 3 or 4 inches) and rated for the lower flue gas temperatures pellet stoves produce. 

The short answer: if you're installing a wood stove or fireplace in a U.S. home that doesn't have an existing masonry chimney, Class A insulated chimney pipe is the system you need.Class A pipe is double-walled, factory-built, insulated, and certified to UL 103 HT for solid fuel appliances. 

In the United States, chimney (vent) sizing is governed mainly by NFPA 211 (solid fuel), NFPA 54 / ANSI Z223.1 (gas), and UL listings for the chimney or vent itself. Sizing is driven by appliance outlet diameter, BTU input, fuel type, draft type (natural, induced, direct vent), and elevation. 

Your chimney pipe must extend at least 3 feet above the point where it exits the roof and at least 2 feet higher than any part of the roof or structure within 10 feet. This is the 3-2-10 rule, required by NFPA 211. Following it keeps your home safe and your wood stove drafting properly.

Yes. If your house has no existing chimney, you can install a wood stove using a Class A insulated chimney pipe system. The pipe runs either straight up through the ceiling and roof (internal route) or out through an exterior wall and up the side of the building (external route). Both methods are code-compliant, safe, and used in thousands of homes every year.