ASHRAE Journal - June 2020 - 16
TECHNICAL FEATURE
FIGURE 2 Partial building section, including mechanical equipment mezzanine.
Lab
117
Corridor
111
Lab
116
protection, health and safety, and
PHOTO 1 Mechanical equipment mezzanine.
air quality due to the use of potentially hazardous chemicals and
materials. To meet these requirements, numerous applicable
codes and standards including the
International Building, Mechanical
and Fire Codes; NFPA 13 and NFPA
45; ASHRAE Standard 62.1 and
ASHRAE/IES Standard 90.1; ANSI/
AIHA/ASSP Z9.5; and ASHRAE
Handbook-Fundamentals must be carefully reviewed.
Ventilation and engineered containment equipment (such as fume
hoods) are critical to maintaining safe air quality. PNNL's design
standard is to provide 6 air changes/hour (ach)
volume (VAV) hoods, AIHA/ASSP Z9.5 recommends
minimum during occupied hours, equal to 685 cfm
150 ach to 375 ach minimum1 within the hood, which
is about 115 cfm to 290 cfm (54 L/s to 137 L/s) for a
(323 L/s) in each of GPCL's lab spaces given a ceiling
6 ft (1.8 m) hood. At GPCL, the minimum required
height at 10 ft (3 m). However, exhaust flow through
exhaust in each lab, including fume hood exhaust
fume hoods often exceeds 6 ach, particularly if the
(sashes closed), general exhaust and snorkel exhaust is
hoods are constant volume type. For variable air
16
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ASHRAE Journal - June 2020
Table of Contents for the Digital Edition of ASHRAE Journal - June 2020
Contents
ASHRAE Journal - June 2020 - Intro
ASHRAE Journal - June 2020 - Cover1
ASHRAE Journal - June 2020 - Cover2
ASHRAE Journal - June 2020 - 1
ASHRAE Journal - June 2020 - Contents
ASHRAE Journal - June 2020 - 3
ASHRAE Journal - June 2020 - 4
ASHRAE Journal - June 2020 - 5
ASHRAE Journal - June 2020 - 6
ASHRAE Journal - June 2020 - 7
ASHRAE Journal - June 2020 - 8
ASHRAE Journal - June 2020 - 9
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ASHRAE Journal - June 2020 - 11
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ASHRAE Journal - June 2020 - 14
ASHRAE Journal - June 2020 - 15
ASHRAE Journal - June 2020 - 16
ASHRAE Journal - June 2020 - 17
ASHRAE Journal - June 2020 - 18
ASHRAE Journal - June 2020 - 19
ASHRAE Journal - June 2020 - 20
ASHRAE Journal - June 2020 - 21
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ASHRAE Journal - June 2020 - Cover3
ASHRAE Journal - June 2020 - Cover4
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