21
Installation and operation manual
–
DTHR-V9-2020
•
Recommended wall vertical Flue Vent Exhaust
Important
The
flue vent
and
combustion air
duct can have a
maximum equivalent length of 100 feet calculated
.
The equivalent length is calculated by adding the lengths of straight sections of the flue vent, to the
equivalent length of all the elbow pipes used. A 90-degree elbow pipes has an equivalent length of 3m
(10’) and
a 45 degree angle elbow pipes
has an equivalent length of 1.5m (5’)
.
DTHR
Model
Unit Flue vent
diameter
Ducting Flue vent
diameter
(minimum)
Combustion Air
intake diameter
(minimum)
Inches
mm
Inches
mm
Inches
mm
35
6
152.4
6
152.4
8
203.2
40
50
55
65
75
8
203.2
8
203.2
10
254
85
100
10
254
10
254
12
304.8
125
150
