ASHRAE Journal - March 2009 - 64

Figure 1a (left): New F7 (~MERV13) ἀberglass bag ἀlter. Figure 1b (right): The same ἀlter after ἀve months of continuous operation. Used Filters By Gabriel Bekö, Ph.D. And Indoor Air Quality T he presence of used filters in a ventilation system can have an adverse impact on perceived air quality, Sick Building Syndrome symptoms, and performance of office work. This article briefly summarizes earlier works leading to this conclusion, as well as reviews our more recent studies performed to gain better understanding of this problem. Possible mechanisms responsible for the emission of noxious compounds from ventilation filters are described. Finally, the economic impact of polluting ventilation filters and possible engineering solutions are discussed. Mechanical ventilation systems are commonly used to ensure that ventilation standards and guidelines are met. However, studies have documented that building occupants, especially in older and mechanically ventilated buildings, 64 ASHRAE Journal productivity.4,5 The prevalence of asthma and allergic diseases has increased during the past decades, most likely due to changes in environmental exposure. 6 Many of the particles either generated indoors or entering the buildings from outdoors can trigger allergic reactions, asthma, and upper and lower respiratory symptoms.7 Moreover, epidemiological studies report close association between outdoor airborne particles and mortality and morbidity.8 Particulate pollutants (smoke, dust f ibers, bioaerosols such as viruses, bacteria, and microorganisms) and gaseous pollutants may enter the buildings About the Author Gabriel Bekö, Ph.D., is a post-doctoral research fellow at the International Centre for Indoor Environment and Energy, Department of Civil Engineering, Technical University of Denmark in Lyngby, Denmark. consider the indoor air quality unacceptable and suffer from Sick Building Syndrome (SBS) symptoms, sometimes referred to as Building-Related Symptoms (BRS).1,2,3 Consequently, poor air quality can negatively affect occupants’ ashrae.org March 2009

ASHRAE Journal - March 2009

Table of Contents for the Digital Edition of ASHRAE Journal - March 2009

Contents
Commentary
Industry News
Letters
Meetings and Shows
Special Section
    2009 ASHRAE Technology Awards
Feature Articles
    Heat Recovery for Office Tower
   Air Motion Control in the Hospital Operating Room
   Anniversary Feature: Five Defrost Methods for Commercial Refrigeration
   Groundwater Issues: Commercial Open Loop Heat Pump Systems
   Used Filters and Indoor Air Quality
Building Sciences
Emerging Technologies
Washington Report
Products
Special Products
People
Classified Advertising
Advertising Index
ASHRAE Journal - March 2009 - Cover1
ASHRAE Journal - March 2009 - Cover2
ASHRAE Journal - March 2009 - 1
ASHRAE Journal - March 2009 - 2
ASHRAE Journal - March 2009 - Contents
ASHRAE Journal - March 2009 - 4
ASHRAE Journal - March 2009 - Commentary
ASHRAE Journal - March 2009 - Industry News
ASHRAE Journal - March 2009 - 7
ASHRAE Journal - March 2009 - 8
ASHRAE Journal - March 2009 - 9
ASHRAE Journal - March 2009 - Letters
ASHRAE Journal - March 2009 - 11
ASHRAE Journal - March 2009 - 12
ASHRAE Journal - March 2009 - 13
ASHRAE Journal - March 2009 - Meetings and Shows
ASHRAE Journal - March 2009 - 15
ASHRAE Journal - March 2009 -     2009 ASHRAE Technology Awards
ASHRAE Journal - March 2009 - 17
ASHRAE Journal - March 2009 - 18
ASHRAE Journal - March 2009 - 19
ASHRAE Journal - March 2009 - 20
ASHRAE Journal - March 2009 - 21
ASHRAE Journal - March 2009 -     Heat Recovery for Office Tower
ASHRAE Journal - March 2009 - 23
ASHRAE Journal - March 2009 - 24
ASHRAE Journal - March 2009 - 25
ASHRAE Journal - March 2009 - 26
ASHRAE Journal - March 2009 - 27
ASHRAE Journal - March 2009 - 28
ASHRAE Journal - March 2009 - 29
ASHRAE Journal - March 2009 -    Air Motion Control in the Hospital Operating Room
ASHRAE Journal - March 2009 - 31
ASHRAE Journal - March 2009 - 32
ASHRAE Journal - March 2009 - 32A
ASHRAE Journal - March 2009 - 32B
ASHRAE Journal - March 2009 - 32C
ASHRAE Journal - March 2009 - 32D
ASHRAE Journal - March 2009 - 32E
ASHRAE Journal - March 2009 - 32F
ASHRAE Journal - March 2009 - 33
ASHRAE Journal - March 2009 - 34
ASHRAE Journal - March 2009 - 35
ASHRAE Journal - March 2009 - 36
ASHRAE Journal - March 2009 - 37
ASHRAE Journal - March 2009 -    Anniversary Feature: Five Defrost Methods for Commercial Refrigeration
ASHRAE Journal - March 2009 - 39
ASHRAE Journal - March 2009 - 40
ASHRAE Journal - March 2009 - 41
ASHRAE Journal - March 2009 - 42
ASHRAE Journal - March 2009 - 43
ASHRAE Journal - March 2009 - 44
ASHRAE Journal - March 2009 - 45
ASHRAE Journal - March 2009 - 46
ASHRAE Journal - March 2009 - 47
ASHRAE Journal - March 2009 - 48
ASHRAE Journal - March 2009 - 49
ASHRAE Journal - March 2009 - 49A
ASHRAE Journal - March 2009 - 49B
ASHRAE Journal - March 2009 - 50
ASHRAE Journal - March 2009 - 51
ASHRAE Journal - March 2009 -    Groundwater Issues: Commercial Open Loop Heat Pump Systems
ASHRAE Journal - March 2009 - 53
ASHRAE Journal - March 2009 - 54
ASHRAE Journal - March 2009 - 55
ASHRAE Journal - March 2009 - 56
ASHRAE Journal - March 2009 - 57
ASHRAE Journal - March 2009 - 58
ASHRAE Journal - March 2009 - 59
ASHRAE Journal - March 2009 - 60
ASHRAE Journal - March 2009 - 61
ASHRAE Journal - March 2009 - 62
ASHRAE Journal - March 2009 - 63
ASHRAE Journal - March 2009 -    Used Filters and Indoor Air Quality
ASHRAE Journal - March 2009 - 65
ASHRAE Journal - March 2009 - 66
ASHRAE Journal - March 2009 - 67
ASHRAE Journal - March 2009 - 68
ASHRAE Journal - March 2009 - 69
ASHRAE Journal - March 2009 - 70
ASHRAE Journal - March 2009 - 71
ASHRAE Journal - March 2009 - 72
ASHRAE Journal - March 2009 - 73
ASHRAE Journal - March 2009 - 74
ASHRAE Journal - March 2009 - Building Sciences
ASHRAE Journal - March 2009 - 76
ASHRAE Journal - March 2009 - 77
ASHRAE Journal - March 2009 - 78
ASHRAE Journal - March 2009 - 79
ASHRAE Journal - March 2009 - Emerging Technologies
ASHRAE Journal - March 2009 - 81
ASHRAE Journal - March 2009 - 82
ASHRAE Journal - March 2009 - 83
ASHRAE Journal - March 2009 - 84
ASHRAE Journal - March 2009 - 85
ASHRAE Journal - March 2009 - 86
ASHRAE Journal - March 2009 - Washington Report
ASHRAE Journal - March 2009 - Products
ASHRAE Journal - March 2009 - 89
ASHRAE Journal - March 2009 - Special Products
ASHRAE Journal - March 2009 - 91
ASHRAE Journal - March 2009 - People
ASHRAE Journal - March 2009 - Classified Advertising
ASHRAE Journal - March 2009 - 94
ASHRAE Journal - March 2009 - 95
ASHRAE Journal - March 2009 - Advertising Index
ASHRAE Journal - March 2009 - Cover3
ASHRAE Journal - March 2009 - Cover4
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