Chapter - 3
MNL000442.doc
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09/19/2016
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[4] Exhaust rates apply to Gasguard Source System supplied VMBs only. VMBs
supplied by a bulk source must have a 0.040 inch or smaller orifice installed in the
inlet connection in order to use these rates.
Table 1C: Minimum Exhaust Requirements for
Gasguard High Flow Enclosures Containing Disilane
(Dilution of maximum potential leak to < ½ LFL and meet former UFC)
Access Port Closed
Access Port Open
Enclosure
Size [1]
Exhaust flow
(cfm)
Static pressure
(in H20)
Exhaust flow
(cfm)
Average Duct
Velocity
1 CYLINDER, Si2H6
325
-0.31
350
1783
2 CYLINDER, Si2H6
475
-0.54
490
2496
Notes
: [1] All vent stack duct sizes are 6 inch (154 mm) diameter.
[2] “Access Hatch Open” values produced average velocities greater than 200fpm the
access hatch opening at all points.