Mi-T-M HGM Série Instructions D'opération page 12

draft diVerter
enclOsed rOOm VentilatiOn
2
VentilatiOn:
. Installation of this unit in an indoor or in an enclosed area should be performed
by a qualified serviceman and all venting must conform to all local, state and
national codes, including the National Fuel Gas Code ANSI Z223.1/NFPA
No. 54. In Canada; Refer to the CSA B49. Gas Installation Code. The
burner exhaust should be stacked to the outside atmosphere and a draft
diverter should be installed as well.
NOTE: There should be no more than 6500 BTU per square inch of flue.
2. A draft diverter must be installed above the exhaust outlet. This diverter
breaks the chimney effect and enhances the draft through the burner for a
more efficient flame. It also helps prevent cold air down drafts from freezing
the heat exchanger.
3. Install the recommended flue pipe per local, state and national codes,
including the National Fuel Gas Code ANSI Z223./NFPA No. 54. In Canada;
Refer to the CSA B49. Gas Installation Code. If the flue pipe exceeds 10
feet in length or contains more than two elbows, the natural draft may be
eliminated and the burner will not ignite. DO NOT install a movable flue
pipe damper.
4. If the unit is being installed in an enclosed room, provide adequate air for
combustion by installing openings to the room near the ceiling for ventilation
and near the floor for burner combustion. These openings should be sized
using one square inch for each 000 BTU per inch of the machine.
Example: A heater module with a 400,000 BTU input requires openings of 400
square inch or approximately 3 feet x 1 foot.
5. If the building in which the unit is being installed seems unusually tightly
constructed, it is recommended that air intakes extending to the outside of the
building be employed to supply combustion air. End the intakes outside the
building with a downward opening to protect these intakes from snow and/or
rain. Include a mesh screen no smaller than 1/4" over the opening.
installatiOn
HGM-SERIES Hot Water Heater module Operator's Manual