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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 a quantity of three 90° elbows can be installed in a vertical vent
11A. Combined System Length: Tube Heater + Vent + Combustion Air Duct
MINIMUM VENT LENGTH: (Vented or Unvented)
Minimum vent length of 3 ft (91 cm) is required (NOTE: 200,000 LP: Minimum 8 ft (244 cm)
MAXIMUM SYSTEM LENGTH (includes: Tube Heater length + combustion air duct + vent):
Each 90° elbow in the system has an equivalent length of 5 ft.
A maximum of 2 elbows are allowed in any portion (duct, tube heater, vent) with the ex-
ception of up to three 90° elbows in a vertical vent run through the roof
The maximum length of combustion air duct to any heater is not to exceed 30 feet
Exceeding the allowable lengths in the table below can create combustion and/or conden-
sation problems and will void CSA Design Certification and the heater warranty.
Max. Combined
Input
System Length*
(Btuh)
Do Not Exceed
45,000
60,000
80,000
110,000
100 ft
130,000
100 ft
150,000
100 ft
175,000
120 ft
200,000
120 ft
* Do not exceed the Maximum Combined System Length regardless of the allowed maximum
length of individual vent or combustion air duct
:
Max. Vent
Length*
60 ft
Up to 30 ft
60 ft
Up to 30 ft
80 ft
Up to 40 ft
Up to 40 ft
Up to 40 ft
Up to 40 ft
Up to 50 ft
Up to 50 ft
FIGURE 22
Approved
Cap
24"
60 cm
A p p r o v e d
'B' Vent
Max. Air Duct
Length*
Example
Up to 20 ft
150,000 Btuh Heater:
Up to 30 ft
Tube Heater Length 50 ft
Up to 30 ft
1 x 90° elbow (vent) 5 ft
Up to 30 ft
Straight vent
Up to 30 ft
1 x 90° elbow (duct) 5 ft
Up to 30 ft
Air Duct
Up to 30 ft
Combined Length
Up to 30 ft
Max. Allowed
31
9
Up
to
12
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
20 ft
17 ft
97 ft
100 ft
STW-JZ / IW I&O Manual
RD: AUG 2013
:
IM101229
RL: 12B- BA
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