ASHRAE Journal - November 2019 - 51

ASHRAE - CELEBRATING 125 YEARS

(21 CFR Parts 210 and 211) and medical devices (21 CFR 820) were made
final in 1978. They were intended to
help ensure the safety and efficacy of
all products and referenced cleanrooms and cleanroom standard FEDSTD-209A and later amendments.
GMP requirements for devices were
intended to govern the methods used
in and the facilities and controls used
for the design, manufacture, packaging, labeling, storage, installation,
and servicing of all finished medical
devices intended for human use.24,25

Figure 6 Semiconductor Multilevel Cleanroom.26 Courtesy M+W Group

Cleanroom Technology
Cleanroom HVAC designs have seen changes since
Whitfield's first "laminar flow" cleanroom, but
his principal idea of self-cleaning cleanrooms has
remained the same. Unidirectional cleanrooms are
still based upon vertical or horizontal air movement.

Industries like semiconductors and microelectronics created multi-level vertical unidirectional cleanrooms (Figure 6) to allow for their complex process
requirements. The spread of cleanroom applications
spurred the creation of industries focused on the
design and manufacture of cleanrooms and cleanroom

YEAR
LIMITED
WARRANTY
ARRANTY

BUILT TO EXCEL
UNDER PRESSURE.

Contact your local Ruskin representative,
or visit ruskin.com for more information.

In high-performance data center environments,
maintaining proper airflow isn't just important -
it's critical. AMCA Class 1A Leakage rated CD50,
CD60 and TED50 control dampers from Ruskin®
excel in these applications. In conditions where
outside temperatures are lower than inside,
the TED50 thermal efficient model features
insulated blades with a break between twin
seals to eliminate thermal transfer and reduce
condensation. Count on the proven strength of
Ruskin control dampers to deliver reliable airflow
control under pressure.

N O V E M B E R 2 0 19

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ASHRAE Journal - November 2019

Table of Contents for the Digital Edition of ASHRAE Journal - November 2019

Contents
ASHRAE Journal - November 2019 - Intro
ASHRAE Journal - November 2019 - Cover1
ASHRAE Journal - November 2019 - Cover2
ASHRAE Journal - November 2019 - 1
ASHRAE Journal - November 2019 - Contents
ASHRAE Journal - November 2019 - 3
ASHRAE Journal - November 2019 - 4
ASHRAE Journal - November 2019 - 5
ASHRAE Journal - November 2019 - 6
ASHRAE Journal - November 2019 - 7
ASHRAE Journal - November 2019 - 8
ASHRAE Journal - November 2019 - 9
ASHRAE Journal - November 2019 - 10
ASHRAE Journal - November 2019 - 11
ASHRAE Journal - November 2019 - 12
ASHRAE Journal - November 2019 - 13
ASHRAE Journal - November 2019 - 14
ASHRAE Journal - November 2019 - 15
ASHRAE Journal - November 2019 - 16
ASHRAE Journal - November 2019 - 17
ASHRAE Journal - November 2019 - 18
ASHRAE Journal - November 2019 - 19
ASHRAE Journal - November 2019 - 20
ASHRAE Journal - November 2019 - 21
ASHRAE Journal - November 2019 - 22
ASHRAE Journal - November 2019 - 23
ASHRAE Journal - November 2019 - 24
ASHRAE Journal - November 2019 - 25
ASHRAE Journal - November 2019 - 26
ASHRAE Journal - November 2019 - 27
ASHRAE Journal - November 2019 - 28
ASHRAE Journal - November 2019 - 29
ASHRAE Journal - November 2019 - 30
ASHRAE Journal - November 2019 - 31
ASHRAE Journal - November 2019 - 32
ASHRAE Journal - November 2019 - 33
ASHRAE Journal - November 2019 - 34
ASHRAE Journal - November 2019 - 35
ASHRAE Journal - November 2019 - 36
ASHRAE Journal - November 2019 - 37
ASHRAE Journal - November 2019 - 38
ASHRAE Journal - November 2019 - 39
ASHRAE Journal - November 2019 - 40
ASHRAE Journal - November 2019 - 41
ASHRAE Journal - November 2019 - 42
ASHRAE Journal - November 2019 - 43
ASHRAE Journal - November 2019 - 44
ASHRAE Journal - November 2019 - 45
ASHRAE Journal - November 2019 - 46
ASHRAE Journal - November 2019 - 47
ASHRAE Journal - November 2019 - 48
ASHRAE Journal - November 2019 - 49
ASHRAE Journal - November 2019 - 50
ASHRAE Journal - November 2019 - 51
ASHRAE Journal - November 2019 - 52
ASHRAE Journal - November 2019 - 53
ASHRAE Journal - November 2019 - 54
ASHRAE Journal - November 2019 - 55
ASHRAE Journal - November 2019 - 56
ASHRAE Journal - November 2019 - 57
ASHRAE Journal - November 2019 - 58
ASHRAE Journal - November 2019 - 59
ASHRAE Journal - November 2019 - 60
ASHRAE Journal - November 2019 - 61
ASHRAE Journal - November 2019 - 62
ASHRAE Journal - November 2019 - 63
ASHRAE Journal - November 2019 - 64
ASHRAE Journal - November 2019 - 65
ASHRAE Journal - November 2019 - 66
ASHRAE Journal - November 2019 - 67
ASHRAE Journal - November 2019 - 68
ASHRAE Journal - November 2019 - 69
ASHRAE Journal - November 2019 - 70
ASHRAE Journal - November 2019 - 71
ASHRAE Journal - November 2019 - 72
ASHRAE Journal - November 2019 - 73
ASHRAE Journal - November 2019 - 74
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ASHRAE Journal - November 2019 - 76
ASHRAE Journal - November 2019 - 77
ASHRAE Journal - November 2019 - 78
ASHRAE Journal - November 2019 - 79
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ASHRAE Journal - November 2019 - 81
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ASHRAE Journal - November 2019 - 84
ASHRAE Journal - November 2019 - 85
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ASHRAE Journal - November 2019 - 87
ASHRAE Journal - November 2019 - 88
ASHRAE Journal - November 2019 - Cover3
ASHRAE Journal - November 2019 - Cover4
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