Schwank STR-JZ User Manual
Page 28
28
STR-JZ I&O Manual
IM090831
RD: AUG 2009
RL: 09A- BA
11A. Combined Length of Vent and Combustion Air Duct
:
The individual flue vent or the combustion air duct is not to exceed 50 ft in length.
Inputs: 45 and 60 Mbh: 50 feet maximum combined vent & duct
Total combined vent and duct is reduced by ten feet for every 90° elbow installed in the
vent or duct, and in the tube system
Exceeding the allowable lengths noted above may create condensation problems and will
void CSA Design Certification and the heater warranty.
V
ERTICAL
VENT
THROUGH
THE
ROOF
:
It is the sole responsibility of the installer to
adhere to all current local codes and/or ANSI
Z223.1 / CSA.B149.1 latest editions for all
venting requirements, and practices.
Use an approved ‘B-vent’ termination cap
as supplied by the manufacturer of the
approved ‘B-vent’.
When vent and combustion air are taken
through the roof, the exhaust vent should
always terminate higher than the
combustion air intake, to prevent recycling
the products of combustion back into the
heater.
Approved
Cap
Approved
‘B’ Vent
24”
60 cm
12
9
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
12. COMBUSTION AIR DUCTING
An opening is located on the top surface of the burner housing for combustion air . Ensure ade-
quate clearance around this opening to allow sufficient combustion air supply to the heater.
When a tube heater is operated in a negative air condition or air-born dust or contaminants are
present as in woodworking and welding shops, air for combustion must be ducted from outside
the negative or contaminated area to the 4 inch (10 cm) diameter intake flange supplied on the
blower. Maximum vent and duct length is:
The individual flue vent or the combustion air duct is not to exceed 50 ft in length.
Inputs: 45 and 60 Mbh: 50 feet maximum combined vent & duct
Total combined vent and duct is reduced by ten feet for every 90° elbow installed in the
vent or duct and in the tube system.
Exceeding the allowable lengths noted above may create condensation problems and will
void CSA Design Certification and product warranty.
continued ...
FIGURE 19
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