ASHRAE Journal - November 2019 - 40

ASHRAE - CELEBRATING 125 YEARS

ﬁrst production cleanroom.5 The
Western Electric room was designed
using 99.95% ﬁlters (see sidebar,
History of HEPA Filters, Page 42) and
positive pressurization. Others have
claimed the Olmsted Air Force Base
in Pennsylvania or the U.S. Navy's
North Island Naval Air Station in
San Diego were the home of the ﬁrst
installations.6

Convergence of Ideas
While advances in contamination
control were occurring in manufacturing operations during the 20th
century, the medical profession was
also experimenting with new contamination control methods.
Much research had been conducted in the ﬁrst half of the
20th century on the beneﬁts of

mechanical ventilation. Another
important step in the ﬁeld of airborne infections was the use of
ultraviolet lighting in combination
with mechanical ventilation. Deryl
Hart found that ultraviolet light
would reduce the airborne bacteria
in the operating room.7 While the
use of UV lighting was not directly
part of the ventilation system, it
was integrated with the ventilation
system to ensure adequate mixing
of the air. An operating room at the
Hospital for Sick Children in Toronto
combining air-conditioning ultraviolet lamps was constructed in 1936
(Figure 1). The design allowed testing
the efﬁcacy of air changes and UV
lights in removing bacteria from the
space. Air supply was slow enough
to avoid a feeling of draft but was of

Figure 1 1936 Operating room showing UV lamps.
Air inlet in the upper left.7

sufﬁcient volume to produce 480
air changes per hour. The results
indicated signiﬁcant reduction in
airborne contamination.7
Other studies, guides and regulations covered ventilation and its
effect on disease transmission, fever
therapy, patient comfort and draft
perception, CO2 concentrations,

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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
ASHRAE Journal - November 2019 - 75
ASHRAE Journal - November 2019 - 76
ASHRAE Journal - November 2019 - 77
ASHRAE Journal - November 2019 - 78
ASHRAE Journal - November 2019 - 79
ASHRAE Journal - November 2019 - 80
ASHRAE Journal - November 2019 - 81
ASHRAE Journal - November 2019 - 82
ASHRAE Journal - November 2019 - 83
ASHRAE Journal - November 2019 - 84
ASHRAE Journal - November 2019 - 85
ASHRAE Journal - November 2019 - 86
ASHRAE Journal - November 2019 - 87
ASHRAE Journal - November 2019 - 88
ASHRAE Journal - November 2019 - Cover3
ASHRAE Journal - November 2019 - Cover4
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