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DirectVent Pro Vent Pipe

Applications - DirectVent Pro is a unitized, coaxial venting system designed for use with direct vent gas or propane stoves, heaters, and fireplaces.

Materials and Construction - .020" aluminum inner wall. .018" galvanized steel outer wall. Painted outer walls made of laser-welded .018" galvalume steel. Outer pipe brings combustion air to the appliance. Inner pipe exhausts flue gases to the outside. Gaskets or sealants not required (unless specified by the appliance manufacturer).

Clearances - Specified by the appliance manufacturer.

Listings - DirectVent Pro, in combination with the gas appliance, has been tested and listed as a decorative gas appliance system or as a direct vent heater system by a major testing agency, such as UL, CSA, Warnock Hersey, or OMNI.

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ASK & ANSWER
By Mike from Binghamton, NY on March 1, 2013
Is it ok to connect a piece of rigid direct vent pipe to a piece of flexible pipe?
By Collin on March 1, 2013

Answer:
In regards to the Simpson DirectVent Pro piping, it is necessary to use either all rigid or all flexible piping. While the connection between the two can be made, the manufacturer does not test their components in this way and does not approve their use together.