Vent Pipes and the 4 categories of heating appliance ventilation

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The 4 categories of heating appliance ventilation are made up of different variations of positive and negative pressure as well as whether the machine is Condensing or Non-condensing. I break down what this means in the video.
Centrotherm Innoflue polypropylene Single Wall (SW), Flex and Concentric vent pipe, fittings and accessories for residential & commercial natural gas and propane-fired boilers, water heaters and furnaces. UL 1738 listed and approved for Category IV (power vented, condensing) appliances.
Z-flex brand stainless steel venting pipe, fittings and parts - approved for for installation with Category III (non-condensing, power-vented) and Category IV (condensing, power-vented) gas fired appliances. Recommended for Takagi tankless water heaters.
Note: Z-Vent series will be gradually transitioned to NovaVent. These use a different steel alloy, but meet the same high quality standards set by Z-Flex and are also UL 1738 listed.
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[@bkoski804]

Thanks for the great information.

[@abrahammuhammad2649]

EXTREMELY HELPFUL, THANKS.

[@PEXUniverse]

Thank you for letting us know!

[@jamesfox8930]

Good stuff.

[@2u263]

Informative Video, thanks
Where is the video you refer to that further describes Vent Pipes for water heaters?

[@jacksoncospelich5553]

This guy is a shill for condensing boilers