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SECTION 3: CLEARANCES TO COMBUSTIBLES
9 of 73
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 u-tube.
FIGURE 14: U-TUBE, OPPOSITE 45° TILT
Model
HE15U
HE20UT
HE25UT
HE30UT
HE35UT
HE40UT
HE45UT
HE50UT
A 200 200 200 250 250 275 300 300
B 1370 1530 1530 1630 1780 1830 1880 1930
C 1500 1650 1650 1860 1960 2040 2110 2160
D 560 560 560 560 560 560 560 560
A
C
D
B
FIGURE 15: U-TUBE, PROTECTIVE GRILLE
Model
HE15UT
HE20UT
HE25UT
HE30UT
HE35UT
HE40UT
HE45UT
HE50UT
A 150 150 150 150 150 150 200 200
B 890 970 970 1020 1170 1220 1270 1380
C 1580 1730 1730 1910 1980 2050 2110 2210
D 760 940 940 1000 1090 1150 1200 1300
A
C
D
B
FIGURE 16: U-TUBE, VENTING
Model
HE15UT
HE20UT
HE25UT
HE30UT
HE35UT
HE40UT
HE45UT
HE50UT
E 1000 1000 1000 1000 1000 1000 1000 1000
F 500 500 500 500 500 500 500 500
Radiant tubes
Fan
Unvented
Vented
E
F