The article focuses on the best practices of safety engineers in determining the proper monitoring of gases in a confined space. It states that engineers must thoroughly understand the facility and its processes before entering and working in it. Their knowledge of the space is essential to avoid accident due to the presence of hazardous or toxic gases that include carbon monoxide and hydrogen sulfide. It is important for engineers to conduct a preentry test before anyone enters the space using a motorized sampling pump that draws air from inside the area.