Chapter - 3
MNL000442.doc
Revision 00
09/19/2016
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
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Table 2: Exhaust Recommendations for Gasguard Equipment Containing
Gases with a TLV
≥
0.20 ppm
(25% TLV
>
0.050 ppm)
Access Port Closed
Access Port Open
Maximum
ERC
[1]
Exhaust
Flow
Static
Pressure
Velocity
Pressure
Exhaust
Flow
Velocity
Pressure
Average
Duct
Velocity
Minimum
Face
Velocity
Average
Face
Velocity
Baffle
ppm
scfm
inches
H2O
inches
H2O
scfm
inches
H2O
fpm
fpm
fpm
No ESI
[2]
0.029
75
-0.5
0.05
318
0.255
1622
180
220
None
ESI
< 0.029
75
-1.5
0.15
237
0.775
1210
210
236
33%
Notes
:
[1
] ERC (Expected Release Concentration) values are taken from actual test data.
[2] ESI (Ex
hau
st Stack Insert) may have been specified by the customer to enhance the readability
of the exhaust pressure monitor. Refer to the system’s Specification Sheet to determine if this
option is used.
[3] These exhaust flow values are applicable to the 30 inch and 24 inch standard flow Gasguard
VMB enclosures.
[4] All standard Gasguard enclosures are sized for a 6 inch outer diameter (OD) duct connection
to the vent stack.
[5] “Access Hatch Closed” values have been measured, or calculated at the exhaust stack duct.
[6] The actual values presented in "Access Port Open" are from experiments done on a two-
cylinder source system enclosure. Due to the similar design and smaller access port of the
VMB enclosure, balancing to Tables 2 and 3 will satisfy meet or exceed NFPA face velocity
requirements.
Table 3: Exhaust Recommendations for Gasguard Equipment Containing
Gases with a TLV between 0.050 and 0.20 ppm
(25% TLV: 0.0125 - 0.050 ppm)
[Includes the following pure (100%) gases: Chlorine Trifluoride, Diborane, Arsine]
Access Port Closed
Access Port Open
Maximum
ERC
[1]
Exhaust
Flow
Static
Pressure
Velocity
Pressure
Exhaust
Flow
Velocity
Pressure
Average
Duct
Velocity
Minimum
Face
Velocity
Average
Face
Velocity
Baffle
ppm
scfm
inches
H2O
inches
H2O
scfm
inches
H2O
fpm
fpm
fpm
No ESI
[2]
0.007
120
-0.5
0.01
272
0.14
1392
240
266
33%