SECTION 3: CLEARANCES TO COMBUSTIBLES
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings, tees, elbows and crosses.
2.Clearances B, C and D can be reduced by 50% after 7500 mm of tubing downstream from the burner.
3.All measurements are in millimeters.
4.Add 60 mm clearance to uncovered
FIGURE 15: U-TUBE, OPPOSITE 45° TILT
A |
B 
D
C
Model A B C D
BH15UT
200
1370
1500
560
BH20UT
200
1530
1650
560
BH25UT/EF
200
1530
1650
560
BH30UT/EF
250
1630
1860
560
BH35UT/EF
250
1780
1960
560
BH40UT/EF
275
1830
2040
560
BH45UT/EF
300
1880
2110
560
BH50UT/EF
300
1930
2160
560
FIGURE 16: U-TUBE, PROTECTIVE GRILLE
A |
B 
D
C
Model A B C D
BH15UT
150
890
1580
760
BH20UT
150
970
1730
940
BH25UT/EF
150
970
1730
940
BH30UT/EF
150
1020
1910
1000
BH35UT/EF
150
1170
1980
1090
BH40UT/EF
150
1220
2050
1150
BH45UT/EF
200
1270
2110
1200
BH50UT/EF
200
1380
2210
1300
FIGURE 17: U-TUBE, VENTING
| E |
Radiant tubes | Fan |
F |
Model
E
F
BH15UT
1000
500
BH20UT
1000
500
BH25UT/EF
1000
500
BH30UT/EF
1000
500
BH35UT/EF
1000
500
BH40UT/EF
1000
500
BH45UT/EF
1000
500
BH50UT/EF
1000
500
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