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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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The information provided within is for informational purposes only. We have made every effort to ensure the accuracy of the provided information and assume no responsibility for any loss or damage due to errors or omissions or to the use or misuse of any information supplied. It is impossible to test all products under all conditions to which they might be subjected in the field. It is therefore the buyer and/or end users' responsibility to test all products under the conditions that duplicate the service conditions prior to installation. All improvements, all specifications are subject to change without prior notice. It is the buyer and/or end users' responsibility to review our complete Terms and Conditions.

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