LAARS Heating Systems
Page 6
Model
A
B
C
D
E
1600
29.3 (
75
)
79.8 (
203
)
38.0 (
96
)
57.5 (
147
)
49.8 (
126
)
2000
29.3 (
75
)
79.8 (
203
)
38.0 (
96
)
57.5 (
147
)
49.8 (
126
)
2500
30.8 (
78
)
87.0 (
221
)
41.5 (
105
)
60.5 (
154
)
60.8 (
154
)
3000
30.8 (
78
)
87.0 (
221
)
41.5 (
105
)
60.5 (
154
)
60.8 (
154
)
3500
34.5 (
88
)
97.5 (
248
)
52.0 (
133
)
70.0 (
178
)
60.8 (
154
)
4000
34.5 (
88
)
97.5 (
248
)
52.0 (
133
)
70.0 (
178
)
60.8 (
154
)
inches (cm)
Model
G
H
J
K
N
P
1600
60.8 (
154
)
2.6 (
7
)
8.4 (
21
)
67.4 (
171)
30.4 (
77
)
16.0 (
41
)
2000
60.8 (
154
)
2.6 (
7
)
8.4 (
21
)
67.4 (
171)
30.4 (
77
)
16.0 (
41
)
2500
71.0 (
180
)
4.0 (
10
)
9.8 (
25
)
76.4 (
194
)
34.5 (
88
)
17.7 (
45
)
3000
71.0 (
180
)
4.0 (
10
)
9.8 (
25
)
76.8 (
195
)
34.5 (
88
)
17.7 (
45
)
3500
81.3 (
207
)
7.0 (
18
)
8.3 (
21
)
86.4 (
219
)
40.0 (
102
)
21.6 (
55
)
4000
81.3 (
207
)
7.0 (
18
)
8.3 (
21
)
86.4 (
219
)
40.0 (
102
)
21.6 (
55
)
inches (cm)
Model
Q
R
S
T
U
1600
23.0 (
58
)
10.2 (
26
)
14.0 (
36
)
13.0 (
33
)
6.3 (
16
)
2000
23.0 (
58
)
10.2 (
26
)
14.0 (
36
)
13.0 (
33
)
6.3 (
16
)
2500
27.2 (
69
)
11.8 (
30
)
18.3 (
46
)
14.8 (
38
)
6.0 (
15
)
3000
27.2 (
69
)
11.8 (
30
)
18.3 (
46
)
14.8 (
38
)
6.0 (
15
)
3500
30.7 (
78
)
13.0 (
33
)
16.0 (
41
)
17.4 (
44
)
6.7 (
17
)
4000
30.7 (
78
)
13.0 (
33
)
16.0 (
41
)
17.4 (
44
)
6.7 (
17
)
inches (cm)
1.G Venting Dimensions & Sizing
1.H Dimensions
Venting
Information
inches
cm
inches
cm
ft**
m
inches
cm
ft**
m
inches
cm
6
15
6
15
100
30.5
6
15
50
15.2
14
36
6
15
8*
20*
100
30.5
8*
20*
100
30.5
14
36
2000
8
20
8
20
100
30.5
8
20
100
30.5
14
36
8
20
8
20
100
30.5
8
20
50
15.2
18
46
8
20
10*
25*
100
30.5
10*
25*
100
30.5
18
46
3000
10
25
10
25
100
30.5
10
25
100
30.5
18
46
10
25
10
25
100
30.5
10
25
50
15.2
22
56
10
25
12*
30*
100
30.5
12*
30*
100
30.5
22
56
4000
12
30
12
30
100
30.5
12
30
100
30.5
22
56
*A vent increaser at the boiler outlet is required
**Equivalent Feet: Equivalent Feet: To calculate maximum equivalent length, measure the linear feet of the pipe
and add 5 feet (1.5m) for each elbow used.
***Category II:
Category II pipe size may vary. Draft must remain between -0.01 and -0.001" w.c..
Notes:
1. Installations in the U.S. require exhaust vent pipe that is CPVC complying with ANSI/ASTM D1785 F441,
stainless steel complying with UL1735, or polypropylene complying with ULC S636.
2. Installations in Canada require exhaust vent pipe that is certified to ULC S636.
3. Intake (air) pipe must be PVC or CPVC that complies with ANSI/ASTM D1785 F441, ABS that complies with
ANSI/ASTM D1527, stainless steel, or galvanized material.
1600
2500
3500
Vent / Air
Connector Size
Model
Maximum
Ducted Air Pipe
Length
Air Pipe Size
Typical
Category II Vent
Pipe Size***
Maximum
Category IV
Vent Pipe
Length
Category IV
Vent Pipe Size
