Boiler Flue Vents

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What is the difference between category I, II, II and IV boiler vents. Which boiler vents are considered negative or positive pressure vents. Which boiler vents are considered non-condensing versus condensing? What are the requirements for a condensing boiler flue?

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You forget to mention the stainless steel flue pipe for condensing boilers. In heavy commercial you see stainless flue quite often. Its very expensive and a pain to install, but it works great

jasonjohnsonHVAC