Chapter - 3
MNL000442.doc
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09/19/2016
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Table 1A: Minimum Exhaust Requirements for
Gasguard High Flow Enclosures Containing Silane
to meet CGA Requirements of 300x Potential Leak Rate Dilution
Access Port Closed
Access Port Open
Enclosure
Size [1]
exhaust
flow
(cfm)
static
pressure
(in H20)
velocity
pressure
(in H20)
exhaust
flow
(cfm)
static
pressure
(in H20)
velocity
pressure
(in H20)
4 Stick (24 inch) SiH4
750
-1.10
1.03
750
-1.0
1.04
8 Stick (30 inch) SiH4
750
-1.10
1.03
750
-1.0
1.04
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.
[3] No Baffles were used on window or in interior.
[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 1B: Minimum Exhaust Requirements for
Gasguard High Flow Enclosures Containing Silane
to meet NFPA Requirements of 250x Potential Leak Rate Dilution
Access Port Closed
Access Port Open
Enclosure
Size [1]
exhaust
flow
(cfm)
static
pressure
(in H20)
velocity
pressure
(in H20)
exhaust
flow
(cfm)
static
pressure
(in H20)
velocity
pressure
(in H20)
4 Stick (24 inch) SiH4
625
-0.8
0.63
625
-0.8
0.76
8 Stick (30 inch) SiH4
625
-0.8
0.64
625
-0.8
0.76
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.
[3] No Baffles were used on window or in interior.