06-06
Table 3.3
SIZE, MILLIMETERS
EXHAUST
PRESSURE DROP
(CFM)
(Pa)
1370 (54") (4 ft. nominal)
7 (260)
35 (0.14)
-------------------------------------------------------
1980 (78") (6 ft. nominal)
11 (390)
35 (0.14)
-------------------------------------------------------
The exhaust air can be connected to the general exhaust
system with indirect connections per VA Standard Detail
15840-20
(Inch of Water Gage) for type B1 and B2 cabinets are listed below
in Table 3.4.
Table 3.4
SIZE
TYPE
MILLIMETERS
EXHAUST
PRESSURE DROP
B1
1370 (54)
7 (256)
175 (0.70)
-------------------------------------------------
B1
1980 (78)
11 (374)
175 (0.70)
-------------------------------------------------
B2
1370 (54)
14 (492)
520 (2.10)
-------------------------------------------------
B2
1980 (78)
24 (840)
520 (2.10)
-------------------------------------------------
Notes:
1.
Provide a dedicated exhaust system for each B1 or B2
hood.
2.
The ductwork shall be stainless steel or optional PVC
coated galvanized steel with spark-proof construction
exhaust fan and explosion proof motor.
3.
The above static pressure valves include drop through
HEPA filter and transition fitting on exhaust side.
The HEPA filter is supplied by the hood manufacturer.
With type B1 hood, the filter is within the hood
casing; the mounting is external with type B2 hood.
Coordinate ceiling height (3 m (10 ft.) with HEPA
filter on the top of B2 hood) requirements and
mounting detail with other disciplines.
17
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