Owner`s manual

GP-MSJW-CX-07B
STW-JZ / IW Manual
RD: Sept, 2005
RL: 7B
KH
12. COMBUSTION AIR DUCT
Where heater is operated in a negative air condi-
tion or in contaminated air atmosphere such as
woodworking shops, air for combustion must be
ducted from outside to intake flange on blower.
The total maximum combined length of vent and
combustion air duct is 80' for STW-JZ / IW-200,
175, 155 and 130, and 50' for STW-JZ / IW 110,
80, 60 and 45. Neither the individual flue vent or
combustion air duct is to exceed 50'. The total
maximum allowable combined vent /air duct is
reduced by ten feet for every 90
o
vent elbow in-
stalled.
Page 18
Where the vent pipe passes through areas where
the ambient temperature is likely to produce con-
densation of the flue gases, the vent pipe shall be
insulated with a suitable material as approved and
specified by the insulation manufacturer.
Check with the manufacturers Technical Support
as to the maximum vent temperature require-
ments.
The vent system must always be adequately sup-
ported to prevent sagging.
(See Fig 4 Page 8)
FIGURE 18 FLUE VENT CONNECTION
For Direct and Indirect Venting it is recommended to install a length of ’C’ Vent onto the end of
the last tube before any fittings are installed. The “C” Vent connection should be slipped onto the
tube and positioned approx 6” beyond the swaged portion of the 4” tube and must be secured with
sheet metal screws.
PLEASE SEE SECTION 14: HEATER EXPANSION (PAGE 20).
FLUE VENT END
OF TUBE