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Z-Flex FAQ's

Z-Flex®, part of the Novaflex Group of companies, is the leading manufacturer of specialty venting systems for furnaces, boilers, water heaters, oil heaters, fireplaces, and more.
The Novaflex Group® is a family owned manufacturing group of companies with one of the broadest product ranges available in the marketplace for the HVAC, industrial venting and hose industries. Throughout a more than thirty year history, Novaflex has earned a solid reputation for providing innovative and high quality products.




When to Z-Flex a Chimney?
  • When a masonry chimney has no liner at all
  • When damage to the existing chimney lining is evident
  • When retrofit appliance has fan-assisted combustion and is vented alone
  • When additional or replacement equipment is installed, or an appliance is converted to gas from another fuel
  • When the existing chimney is over-sized relative to heating requirement
  • When the retrofit appliance has fan-assisted combustion and is vented alone
  • When an additional/replacement equipment is installed or an appliance is converted to gas from another fuel


Installation where Z-Vent extends beyond an exterior wall
  • The appliance is a Bosch tank-less water heater.
  • How do you eliminate the threat of frozen condensate in pipe, in extremely cold climates?
  • Can the pipe be wrapped in a non-combustible insulation?
  • Can an enclosure be constructed around the pipe, observing required clearances?
  • Should the pipe run perfectly horizontal or gradually slope away or toward the house?
Do not apply insulation directly to the vent pipe - an insulated chase can be built with proper clearance to combustible materials. If the condensate runs to an INSIDE drain, the pipe is pitched to the drain, using a proper termination - condensation should not freeze when the unit is running (flue gas temp is above 32°F) and will drain to the condensate drain before freezing.



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