Fume hood exhaust re-entry into a chemistry building

Journal Article · Sat Feb 01 04:00:00 EST 1986 · Am. Ind. Hyg. Assoc. J.; (United States)

DOI:https://doi.org/10.1080/15298668691389432· OSTI ID:5813315

Lamb, B K; Cronn, D R

The rooftop air intakes are in close proximity to the fume hood exhaust vents on the roof of the attached chemistry buildings (Fulmer Hall and Fulmer Annex) at Washington State University. Complaints resulted from the apparent re-entry of hazardous and odorous exhaust vapors and gases returning into the building fresh air supplies. An atmospheric tracer study of the flow patterns and exhaust gas dilution rates determined the suitability of other potential air intake locations. Isopleth maps showed concentration patterns for test conducted during the different wind regimes (southwest prevailing winds and substantial wintertime southeast periods). As expected, the observed dilution rates were greater than the conservative minimum dilution rates calculated from models. Tracer gas concentrations indicated large areas over which odor thresholds would be exceeded for vapors resulting from typical evaporation rates of solvents. Tracer gas concentrations at the building air intakes were about the same as inside building concentrations because little dilution occurred between the intakes and building interiors. Significant infiltration was observed due to negative building pressure relative to outside. The recommendation to move the intakes down the south building walls is being followed since roof-level concentrations are typically a factor of ten or more higher than below-roof levels.

• Research Organization: Washington State Univ., Pullman
• OSTI ID: 5813315
• Journal Information: Am. Ind. Hyg. Assoc. J.; (United States), Journal Name: Am. Ind. Hyg. Assoc. J.; (United States) Vol. 47:2; ISSN AIHAA
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR INFILTRATION
AIR POLLUTION
AIR POLLUTION MONITORING
BUILDINGS
EDUCATIONAL FACILITIES
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
HAZARDOUS MATERIALS
LABORATORY BUILDINGS
MATERIALS
POLLUTION
WASTES