Combustion Air Duct - Schwank SET - SETU Installation And Owner's Manual

V
ERTICAL VENT THROUGH THE ROOF
It is the sole responsibility of the installer to ad-
here 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 ap-
proved 'B-vent'.

When vent and combustion air are taken
through the roof, the exhaust vent should
always terminate higher than the combus-
tion air intake, to prevent recycling the
products of combustion back into the
heater.
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.

High-Fire Inputs: 175 and 200 Mbh:

High-Fire Inputs: 80, 100, 110, 130 and 155 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.
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.

High-Fire Inputs: 175 and 200 Mbh:

High-Fire Inputs: 80, 100, 110, 130 and 155 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.
:
FIGURE 19
Approved
Cap
Approved
'B' Vent
80 feet maximum combined vent & duct
80 feet maximum combined vent & duct
25
24"
60 cm 9
Up
to
12
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
continued ...
SET(U) / ITT(U) Manual
GP-MSET-EX-6A
RD: MAY 2009
RL: 06A - BA