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49
MCA
Pro
45/65/90/115
MCA-Pro ISM Rv.4.1 2/2017
4. Installation
Type 4: Seal combustion system applications
A vertical venting system either coaxial or 2 pipe
system, for the exhaust flue gases and combustion air
at same termination and pressure level.
Combustion air supply
Flue gas outlet
i
• Two pipe system - Vent terminal shall be T
type The vent terminal must be located at
least 3 ft/ 1m away from the combustion air
supply opening.
• Horizontal breeching proportions shall be kept
to a minimum.
• Horizontal sections in the air supply must
slope away from the boiler towards the supply
opening and incorporate a drain connection if
the route rises from a lower point.
• Horizontal sections of the venting must slope
downward towards the boiler ½"/ per linear
foot (42mm/m) and adequate vent support
must be provided.
• The maximum length L as seen in the drawing
can be found in the table.
Vertical vented with sealed combustion air (two pipe system) (L1 + L2 combined length)
MCA
Pro
Vent ø
Max. length
Number of elbows 90˚ and equivalent feet/meters
2
3
4
5
6
7
8
in
mm
ft
m
ft
m
ft
m
ft
m
ft
m
ft
m
ft
m
ft
m
35
3
80
131
40
105
32
92
28
79
24
66
20
52
16
39
12
26
8
45
3
80
131
40
105
32
92
28
79
24
66
20
52
16
39
12
26
8
65
3
80
79
24
47
14
31
9
15
4
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
65
4
100
131
40
99
30
83
25
67
20
51
16
34
11
18
6
2
1
90
4
100
131
40
99
30
83
25
67
20
51
16
34
11
18
6
2
1
115
4
100
108
33
76
23
60
18
44
13
28
9
11
4
N/A
N/A
N/A
N/A
Vertical vented with sealed combustion air (two pipe system)
MCA
Pro
Vent ø
Max. length
Number of elbows 45˚ and equivalent feet/meters
2
3
4
5
6
7
8
in
mm
ft
m
ft
m
ft
m
ft
m
ft
m
ft
m
ft
m
ft
m
35
3
80
131
40
122
37
118
36
114
35
110
34
105
32
101
31
97
30
45
3
80
131
40
122
37
118
36
114
35
110
34
105
32
101
31
97
30
65
3
80
79
24
70
21
66
20
62
19
58
18
53
16
49
15
45
14
65
4
100
131
40
122
37
118
36
114
35
110
34
105
32
101
31
97
30
90
4
100
131
40
122
37
118
36
114
35
110
34
105
32
101
31
97
30
115
4
100
108
33
99
30
95
29
91
28
87
27
82
25
78
24
74
23
Combustion
air supply
Flue gas
outlet
L1 Plus L2 = Maximum length
* with a 4" to 3" adaptor
*
*
Содержание MCA Pro 115
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