3
Clearances
A minimum 2 inch airspace must be maintained between the exterior of the
Ventis Class-A
chimney system and
combustible materials or as established by factory built supports and firestops. Ensure that building insulation,
electrical wiring and/or any other combustible materials do not violate the required 2-inch airspace clearance.
The clearance between single wall connector pipe
(VENTIS BLACK™ SINGLE WALL STOVEPIPE)
and
unprotected combustible material must not be less than 18-inches (See latest version of NFPA 211). The
distance between the vertical single wall stove pipe and the ceiling may be less than 18-inches depending on the
specifications of the finishing support.
Note:
Except for the installation in one and two-family dwellings, a factory-built chimney that extends through any
zone above that on which the connected appliance is located is to be provided with an enclosure having a fire
resistance rating equal to or greater than that of the floor or roof assemblies through which it passes.
All interior portions of the chimney must be accessible for inspection and cleaning.
For installing the chimney system in a chase application, the chimney must extend a minimum of 6-inches above
the chase cover.
Sizing the Chimney Systems
Always size the chimney liner in accordance with the appliance manufacturer’s instructions. Keep in mind that
the outside diameter will be 2 1/2-inches larger than the inside diameter.
The
Ventis Class-A
chimney system may be installed to a maximum height of 40 feet.
Additional Considerations
It is recommended, in colder climates, that exterior mounted chimney systems are enclosed to help reduce or
limit condensation, creosote build-up and poor draft.
Termination Above the Roof
The termination of the
Ventis
Class-A
chimney system must be
in accord with the NFPA 211
codes. This code requires that a
chimney terminate at least 3 feet
above the point where it penetrates
the roof and 2 feet higher than any
structure within a 10 foot radius.
The maximum height of an
unsupported chimney above the
roof line is 5 feet. Chimney
heights greater than 5 feet above
the roof line must use and
extended roof brace.
General Specifications
