06-06
exhaust duct to ensure constant static pressure in each branch.
See VA Standard Detail 15900-8. The minimum static pressure drop
to operate the valve shall not exceed 93 Pa (0.375 Inch WG).
e. The ductwork shall be galvanized sheet metal material.
3. H7/H13, Chemical Hoods: H7 and H13 hoods have identical requirements
with the exception of the make-up air system. The H7 hoods use all
room air as the make-up air for exhaust; the H13 hoods use 60%
auxiliary make-up air directly ducted to the hoods and remaining 40%
room air for their exhaust needs.
a. Provide a dedicated, corrosion resistant, exhaust system to serve
not more than four H7 or H13 hoods.
b. The exhaust air quantities (m3/min)(CFM) and pressure drops
(Pa)(Inch of Water Gage) for H7 and H13 hoods are listed below in
Table 3.2.
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