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SECTION 3: CLEARANCES TO COMBUSTIBLES
7 of 75
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.
** When installed in the first 6 m - Not for use on EF models.
* BH55ST only available in multiburner.
FIGURE 7: LINEAR & DOUBLE LINEAR, 2 FOOT DECO GRILLE
Model
BH15ST
BH30DL
BH20ST
BH40DL
BH25ST/EF
BH50DL/EF
BH30ST/EF
BH60DL/EF
BH35ST/EF
BH70DL/EF
BH40ST/EF
BH45ST/EF
BH50ST/EF
& BH55ST*
A 150 150 150 150 150 150 200 200
B 890 970 970 1020 1170 1220 1280 1330
C 1570 1650 1650 1780 1930 1970 2010 2080
D 890 970 970 1020 1170 1220 1280 1330
A
C
D
B
FIGURE 8: LINEAR & DOUBLE LINEAR, PROTECTIVE GRILLE
Model
BH15ST
BH30DL
BH20ST
BH40DL
BH25ST/EF
BH50DL/EF
BH30ST/EF
BH60DL/EF
BH35ST/EF
BH70DL/EF
BH40ST/EF
BH45ST/EF
BH50ST/EF
& BH55ST*
A 150 150 150 150 150 150 200 200
B 890 970 970 1020 1170 1220 1280 1330
C 1570 1650 1650 1780 1930 1970 2010 2080
D 890 970 970 1020 1170 1220 1280 1330
A
C
D
B
FIGURE 9: UNDERSHIELD **
Model
BH15ST
BH30DL
BH20ST
BH40DL
BH25ST/EF
BH50DL/EF
BH30ST/EF
BH60DL/EF
BH35ST/EF
BH70DL/EF
BH40ST/EF
BH45ST/EF
BH50ST/EF
& BH55ST*
A 150 150 150 150 150 150 - -
B 990 1020 1270 1270 1370 1400 - -
C 840 965 1120 1120 1220 1270 - -
D 990 1020 1270 1270 1370 1400 - -
A
C
D
B
FIGURE 10: LINEAR & DOUBLE LINEAR, VENTING
Model
BH15ST
BH30DL
BH20ST
BH40DL
BH25ST/EF
BH50DL/EF
BH30ST/EF
BH60DL/EF
BH35ST/EF
BH70DL/EF
BH40ST/EF
BH45ST/EF
BH50ST/EF
& BH55ST*
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