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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 15: 2-FOOT DECO GRILLE
A
C
B
D
FIGURE 16: BARRIER SHIELD
A
B
D
C
FIGURE 17: PROTECTIVE GRILLE
A
C
B
D
Model
A
CRV-B-2
4
12
CRV-B-4
4
12
CRV-B-6
4
12
CRV-B-8
4
12
CRV-B-9
4
18
CRV-B-10
4
18
CRV-B-12
4
18
CRV-B-12A
4
18
Model
A
CRV-B-2
4
12
CRV-B-4
4
12
CRV-B-6
4
12
CRV-B-8
4
12
CRV-B-9
- UNAPPROVED -
CRV-B-10
- UNAPPROVED -
CRV-B-12
- UNAPPROVED -
CRV-B-12A
- UNAPPROVED -
Model
A
CRV-B-2
4
20
CRV-B-4
4
20
CRV-B-6
4
20
CRV-B-8
4
20
CRV-B-9
4
36
CRV-B-10
4
36
CRV-B-12
4
36
CRV-B-12A
4
36
(inches)
B
C
D
48
12
11
48
12
11
48
12
11
48
12
11
56
18
11
56
18
11
56
18
11
56
18
11
(inches)
B
C
D
12
12
11
12
12
11
12
12
11
12
12
11
(inches)
B
C
D
48
20
11
48
20
11
48
20
11
48
20
11
60
36
11
60
36
11
60
36
11
60
36
11
SECTION 6: C
C
LEARANCES TO
OMBUSTIBLES
(centimeters)
A
B
C
31
122
31
31
122
31
31
122
31
31
122
31
46
143
46
46
143
46
46
143
46
46
143
46
(centimeters)
A
B
C
31
31
31
31
31
31
31
31
31
31
31
31
- UNAPPROVED -
- UNAPPROVED -
- UNAPPROVED -
- UNAPPROVED -
(centimeters)
A
B
C
51
122
51
51
122
51
51
122
51
51
122
51
92
153
92
92
153
92
92
153
92
92
153
92
15 of 21
D
D
D
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