Also this: http://www.hvacinsider.com/national/tech--case-study-taking-control-of-odors-in-a-clinical-laboratory http://www.hvacinsider.com/national/tech--case-

Also this: http://www.hvacinsider.com/national/tech--case-study-taking-control-of-odors-in-a-clinical-laboratory http://www.hvacinsider.com/national/tech--case-study-taking-... "The initial approach was to fabricate an acrylic hood that would be placed above the urinalysis workstations and would vent odors directly outside. However, city officials would not permit the laboratory to ventilate the captured air to the outdoors. This prompted Vantari and the IQAir team to focus on air filtration instead of ventilation."