Specifications

The ventilation control measures for nitrous oxide in the delivery room were the scavenging

system (local exhaust ventilation) and the general dilution ventilation (three fresh air supply

outlets located in the ceiling and two wall mounted exhaust grills located near floor level.

4.0 SURVEY EQUIPMENT AND PROCEDURE

4.1 Formaldehyde

4.1.1 Equipment

• Gastec Pump No. 830 (hand-held, piston type), last bench calibrated on June 14, 2001, asset

number 002713 Gastec

• Gastec Detector Tube (Formaldehyde) No. 91LL (0.05 ppm to 1.0ppm), batch number

91220, valid until July 2003

• Gastec Detector Tube No. 91L (Formaldehyde) (0.1 ppm to 4.0 ppm), batch number 00453,

valid until April 2003.

• Sampling pump charger –Model # YL7220LFS, August 1999, serial number 9080006

• Gilian Dual Mode Low Flow Sampler Model LFS 133DC SN-14288, Asset # 84147, WCB

OF BC Laboratory Services checked May 6, 2001.

• Gilian Dual Mode Low Flow Sampler Model LFS 133DC SN-14343, Asset # 84188, Lab

Services checked May 16, 2001.

• SKC Treated Silica Gel Tube, Lot No. 1481, Expires 03/02.

• Gastec Smoke Tester Tube No. 501, batch number 30622.

• Minibuck, A.P. Buck, Model # M-5, Serial # 50621 calibrated April 11, 2001.

4.1.2 Procedure

Formaldehyde levels at the formalin dispensing station were tested for 6.5 hours on July 12,

2001. Silica gel tubes (area samples), colorimetric detector tubes (personal samples) and smoke

tubes (ventilation effectiveness testing) were used throughout the sampling day.