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3940011 12.12
3.1 General
The code requirements for a mechanical draft system are different than those for a gravity venting system
used with gas applications. Generally, the mechanical draft system must be installed a minimum of 3 feet
away from any forced air inlet located within 10 feet and a minimum of 4 feet away from any door
or window. For complete information, consult ENERVEX or your local building codes.
Installation must be in accordance with these instructions and all local codes, or in their
absence, the National Fuel Gas Code, NFPA 54/ANSI 223.1.
This installation manual is for the ENERVEX venting system and assumes that the ISOKERN fireplaces
have already been installed. Installion of the ISOKERN fireplaces, the gas logs and the pilot assembly
should be performed by a qualified ISOKERN technician or a certified gas service agent or supplier. If you
have any questions regarding installation of these components, consult the ISOKERN installation manual.
Important information about ISOKERN IBV fireplaces
• ISOKERN IBV model fireplaces are designed for use with standard B-vent. ENERVEX does not recommend
installing more than 100’ of B-vent in the vertical run of the system. If the common vertical vent is over
100’, you must use a listed pressure stack or another alternative. For information on circumstances where it is
appropriate to use B-vent in a vertical common vent greater than 100’, contact ENERVEX.
• If temperatures in the firebox exceed 160° F, the ISOKERN IBV fireplace has a thermal limit switch that
opens the safety circuit and closes the gas valve.
DO NOT mount the transducer inside an airtight enclosure. It uses the room pressure
as reference pressure.
!
Adequate intake air must be provided for combustion of the fireplaces; otherwise,
improper operation and inadequate venting of deadly flue gases may result.
3. SYSTEM INSTALLATION & SET UP GUIDELINES
