SECTION 3: C
RITICAL
C
ONSIDERATIONS
5
NOTE:
1. All dimensions are from the surfaces of all tubes, couplings, elbows, tees and crosses.
2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream from
where the combustion chamber and the tube connect.
FIGURE 4: UNIVERSAL SHIELD, POSITION 1
(inches)
(centimeters)
Model
A
B
C
D
A
B
C
D
CRV-B-2
4
12
12
12
11
31
31
31
CRV-B-4
4
12
12
12
11
31
31
31
CRV-B-6
4
12
12
12
11
31
31
31
CRV-B-8
4
12
12
12
11
31
31
31
CRV-B-9
8
18
24
18
21
46
61
46
CRV-B-10
8
18
24
18
21
46
61
46
CRV-B-12
8
18
24
18
21
46
61
46
CRV-B-12A
8
18
24
18
21
46
61
46
C
A
B
D
FIGURE 5: UNIVERSAL SHIELD, POSITION 2
(inches)
(centimeters)
Model
A
B
C
D
A
B
C
D
CRV-B-2
4
24
48
24
11
61
122
61
CRV-B-4
4
24
48
24
11
61
122
61
CRV-B-6
4
24
48
24
11
61
122
61
CRV-B-8
4
24
48
24
11
61
122
61
CRV-B-9
4
36
48
36
11
92
122
92
CRV-B-10
4
36
48
36
11
92
122
92
CRV-B-12
4
36
48
36
11
92
122
92
CRV-B-12A
4
36
48
36
11
92
122
92
C
A
B
D
FIGURE 6: UNIVERSAL SHIELD, POSITION 3
(inches)
(centimeters)
Model
A
B
C
D
A
B
C
D
CRV-B-2
4
12
56
30
11
31
143
77
CRV-B-4
4
12
56
30
11
31
143
77
CRV-B-6
4
12
56
30
11
31
143
77
CRV-B-8
4
12
56
30
11
31
143
77
CRV-B-9
8
12
60
42
21
31
153
107
CRV-B-10
8
12
60
42
21
31
153
107
CRV-B-12
8
12
60
42
21
31
153
107
CRV-B-12A
8
12
60
42
21
31
153
107
C
A
B
D
