Windows & Doors as Sources of Error in Indoor Mold Tests
POST a QUESTION or READ FAQs about the errors caused in airborne mold or other particle counts depending on the open/shut position of both windows, exterior doors, and interior doors
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Impact of open or shut windows & doors on airborne mold test & count results:
This article explains the impact of open or shut windows & Doors as Sources of Error in Indoor Mold Tests
This document is a brief tutorial which provides information about the accuracy of and sources of errors in tests for the level of allergenic and toxic mold in residential buildings: Are
spore counts valid? Are cultures and swab tests valid? These critical questions are discussed in this paper.
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
Variation in Airborne Particle Levels as Windows or Doors are Open or Closed
This photograph of an open window in a New York City high rise office building displayed an enormous convection current - notice our low-tech demonstration? The
tissue taped to the underside of the window sash is blowing outside in this photo.
When this window was opened the level of indoor airborne particulate
debris of all types was increased significantly, and further, any problem particles from lower floors were at risk of being drawn up into and through this
office even though there was no problem reservoir in the office itself.
We would expect that opening the windows in a building to "air it out" will result in an indoor airborne particle level which is qualitatively and
quantitatively similar to outdoor air. In some cases this is quite true if ventilation is long enough and if there is not an usual indoor
mold reservoir in the room where testing is performed.
But opening the windows on the upper floor of a residence and certainly opening the
windows in a tall building will usually cause a considerable increase in upwards moving air by convection currents in the building. Warm air
rises from lower to higher areas, exiting at the open window on the upper floor.
The two photographs shown below were taken by stereomicroscope
examining two sequential airborne mold and other particle traces in air samples collected just minutes apart.
The first air sample shows a rather low-density trace of airborne particles captured on a microscope slide using our Burkard Personal Air Sampler (PAS).
The second, very dense
particle sample collected at the same location shows what happened when we opened the window in this high rise building in New York City.
Continue reading at AIR TEST FOR MOLD: ACCURACY or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.
Thanks to Susan Flappan, Flappan Consulting, moldetect.com, Overland Park KS, 913-402-1131, for contributing comments and some suggested text from ACGIH Bioaerosols: Assessment and Remediation 12/2006.
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
Kansas State University, department of plant pathology, extension plant pathology web page on wheat rust fungus: see http://www.oznet.ksu.edu/path-ext/factSheets/Wheat/Wheat%20Leaf%20Rust.asp
"A Brief Guide to Mold, Moisture, and Your Home",
U.S. Environmental Protection Agency US EPA - includes basic advice for building owners, occupants, and mold cleanup operations. See http://www.epa.gov/mold/moldguide.htm
US EPA - Mold Remediation in Schools and Commercial Building [Copy on file at /sickhouse/EPA_Mold_Remediation_in_Schools.pdf ] - US EPA
US EPA - Una Breva Guia a Moho - Hongo [Copy on file as /sickhouse/EPA_Moho_Guia_sp.pdf - en Espanol
Associations: Sick House, Sick Building, SBS - Air Quality, Government, Private Associations and Information Resources
Atlas of Clinical Fungi, 2nd Ed., GS deHoog, J Guarro, J Gene, & MJ Figueras, Centraalbureau voor Schimmelcultures, Universitat Rovira I Virgili, 2000, ISBN 90-70351-43-9 (you can buy this book at Amazon) - The Atlas of Clinical Fungi is also available on CD ROM
"Disease Prevention in Home Vegetable Gardens,"
Department of Plant Microbiology and Pathology,
Department of Horticulture, University of Missouri Extension - extension.missouri.edu/publications/DisplayPub.aspx?P=G6202
Fifth Kingdom, Bryce Kendrick, ISBN13: 9781585100224, is available from the InspectAPedia online bookstore - we recommend the CD-ROM version of this book. This 3rd/edition is a compact but comprehensive encyclopedia of all things mycological. Every aspect of the fungi, from aflatoxin to zppspores, with an accessible blend of verve and wit. The 24 chapters are filled with up-to-date information of classification, yeast, lichens, spore dispersal, allergies, ecology, genetics, plant pathology, predatory fungi, biological control, mutualistic symbioses with animals and plants, fungi as food, food spoilage and mycotoxins.
US EPA: Una Breva Guia a Moho - Hongo [Copy on file as /sickhouse/EPA_Moho_Guia_sp.pdf - en Espanol
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