Gas Trace CV fumehood, What is CV fumehood gas trace, Why gas trace test a CV fumehood

Gas Trace Test CV fumehood (Constant Volume) speaks to what is CV fumehood gas trace and why gas trace a CV fumehood.

Constant air volume fume hoods at the time of initial installation require tracer gas tests to be done.

Existing fume hoods require the tests to be done once every five years.

Tests are as described in PWGSC document MD15128-2008 document Guidelines for Building Owners, Design Professionals, and Maintenance Personnel.

Tracer Gas Containment Test

The Tracer Gas Containment Test is conducted to determine the potential for escape of contaminants from the hood at the sash working height of the fume hood.

To perform this test the below listed equipment is required: Test cart Mannequin Laptop computer Detector (sensor at mannequin nose) Gas ejector

Gas Test Procedure

The mannequin is placed at the center of the hood opening while tracer gas is generated through an ejector located in the hood in front of the mannequin.

Tracer gas is measured using an appropriate detector and recorded at a rate of 1 reading per second, using a data acquisition logger. Data is analyzed to determine the five minute average and maximum concentration in ppm escaping the hood.

Acceptable Results

Tests with sash heights between 300mm and 450 mm open.

Done at manufacturer facility:

  • At peak as manufactured : <0.10 ppm
  • When sash first opened.
  • 5 minute average: <0.05 ppm As Installed:
  • At peak <0.10 ppm
  • When sash first opened.
  • 5 minute average: <0.05 ppm As Used:
  • At peak <0.10 ppm
  • When sash first opened.
  • 5 minute average <0.05 ppm
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