Combustion Air Duct - Schwank S100 Installation & Owner's Manual

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 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

At most three 90° elbows can be installed in a vertical vent
Combined Length of Vent and Combustion Air Duct:
NOTE: 90° Elbows in vent and air duct systems:

For minimum vent length requirements consider each 90° elbow as 5 ft equivalent length

For maximum vent length requirements consider each 90° elbow as 10 ft equivalent length

Inputs 175 and 200 Mbh NG & LP: Minimum vent length equivalent to 17 ft -

The individual flue vent or the combustion air duct is not to exceed 50 ft in length.

Inputs: 130, 155, 175, and 200 Mbh:

Inputs: 45, 60, 80, 100, and 110 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.
13. 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.
Combustion air duct must be constructed of non-combustible material.
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: 130, 155, 175, and 200 Mbh:

Inputs: 45, 60, 80, 100, and 110 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.
:
FIGURE 22
Approved
Cap
Approved
'B' Vent
80 feet maximum combined vent & duct
80 feet maximum combined vent & duct
27
24"
60 cm 9
Up
to
12
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
S100/ITB I&O Manual
IM101230
RD: JAN 2012
RL: 6B- BA