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b1 Airflow Sensing Elements
b1 Flow Transducers
b1 Space Pressure Monitors
Cost of Poor IAQ
Indoor air quality (IAQ) affects the prevalence of several very common health effects including communicable respiratory illnesses such as common colds (e.g. rhinovirus infections), influenza, adenovirus infections, and measles; allergies and asthma; and acute nonspecific health symptoms often called sick building syndrome symptoms. These health effects lead to health care costs plus the costs of sick leave.[1] The following tables show the cost of sick leave based on median salary data for seven major cities within the United Sates. The costs associated with health care, employee benefits, and overhead are not included in the calculations.
Median Salary by City
New York $68,554 Los Angeles $68,131
Chicago $62,337 Dallas $61,172
Houston $61,448 Washington $67,382
Atlanta $61,003 Median Salary $61,893
Source: Payscale, Inc. (December 2009) available at

Number of
Cost of
1 Sick Day
per Year
Cost of
2 Sick Days
per Year
Cost of
3 Sick Days
per Year
Cost of
4 Sick Days
per Year
Cost of
5 Sick Days
per Year
10 $2,398 $4,795 $7,193 $9,590 $11,988
20 $4,795 $9,590 $14,385 $19,181 $23,976
60 $14,385 $28,771 $43,156 $57,542 $71,927
100 $23,976 $47,952 $71,927 $95,903 $119,879
250 $59,939 $119,879 $179,818 $239,758 $299,697
500 $119,879 $239,758 $359,637 $479,515 $599,394
1,000 $239,758 $479,515 $719,273 $959,031 $1,198,788
An even bigger problem may be "presenteeism" - when people come to work even when sick. The problem here is loss of productivity among sick workers. Numerous studies place average productivity losses between 3 and 7 percent (or higher). Overall, presenteeism is 7.5 times more costly than illness-related absenteeism and two to three times more costly than direct medical care. Even more disturbing may be the chain reaction as illnesses are spread to
Even when employees are not sick poor IAQ impacts their productivity. Significant measurable changes in people's ability to concentrate or perform mental or physical tasks are associated with indoor pollution due to lack of ventilation or the presence of pollution sources. Estimates of performance losses from poor IAQ for all buildings suggest a 2 to 4 percent loss on average.[3] The following table shows the costs associated with a 3 percent loss of productivity based on the median salary of $61,893 shown above.

Number of
Annual Cost of
3% Loss of
10 $18,701
20 $37,402
60 $112,207
100 $187,011
250 $467,528
500 $935,055
1,000 $1,870,110
The potential annual savings and productivity gains from improved IAQ in the United States are estimated as high as $14 billion from reduced respiratory disease, $4 billion from reduced allergies and asthma, $30 billion from reduced sick building syndrome, and $160 billion from direct improvements in worker performance that are unrelated to health. Compared with the personnel costs of the occupants any premium associated with ensuring IAQ is insignificant.[4]
Key strategies for improving IAQ include
b2 Maintaining the minimum outdoor air intake flow required by the ventilation rate procedure of Standard 62.1-2007[4]. Ventilation air is used to dilute and remove common sources of indoor contaminants. Paragon’s OAFE-1500 is an Air Movement and Control Association (AMCA) International certified outdoor airflow measurement system capable of producing an overall ±0.5% accuracy through the velocity range of 200 to 1,200 fpm. Since the OAFE-1500 accuracy of ±0.5% is AMCA certified, utilization of the OAFE-1500 for direct measurement of the minimum outdoor air intake flow rate ensures that ASHRAE Standard 62.1-2007 is met.
b2 Maintaining a slightly positive building pressure to eliminate infiltration of common sources of outdoor contaminants and infiltration of water vapor (humidity) which can lead to moisture buildup arising from condensation causing mold growth inside buildings. [3] Paragon’s Airflow Sensing Elements/Stations coupled the MicroTrans Airflow Signal Processor have an accuracy of ±3% of actual flow over a 10:1 turndown range and can be used to accurately maintain building pressure to ensure that returns due to improved IAQ are gained.
[1] Lawrence Berkeley National Laboratory, Indoor Environment Department, Environmental Energy Technologies Division “Health and Productivity Gains from Better Indoor Environments and their Relationship with Building Energy Efficiency” William J. Fisk (2000)
[2] Area Development Site and Facility Planning “The Real Cost of Poor Indoor Air Quality” Duran, Alexandra (August 2005).
[3] U.S. Environmental Protection Agency “IAQ Building Education and Assessment Model (I-BEAM)” (2002).
[4] U.S. Green Building Council “LEED Reference Guide for Green Building Design and Construction” (2009 Edition).
Cost of Poor IAQ
Installation Guidelines