Air purifiers

Class B—Non-IDLH based on oxygen level between 19.5 and 21 percent, but classified as dangerous due to the airborne presence of toxic or poisonous substance Below IDLH level, but greater than the protection factor offered by air-purifying respirators. 

The pesticide mixture sample from the air of the GC lab in which raw materials and pesticide products are analyzed was collected for three consecutive months. The sample to be analyzed was made using the extraction of the filter taken from the air purifier. 

Clean Air Machine Corp. Air purifiers - commercial site offers customized filters for specialty applications aimed at removal of microscopic particulates and gases. http //aco.ca/tibbits/index. html... 

Figure 9-14 shows a typieal full-faee air purifying respirator (FF APR) with eartridges attaehed. Figure 9-15 shows what a worker donning modified level C proteetion (diseussed earlier in this ehapter) might look like. 

Figure 9-18 shows what the respirator looks like when assembled and ready to use. Figure 9-19 shows the eomponents of a powered air purifying respirator (PAPR). A typieal PAPR system uses a small fan to... 

FIGURE 9-19. Typical components of a powered air purifying respirator. Photo Courtesy 3M... 

Air-purifying respirator A respirator that removes airborne contaminants, such as particulates, gases, vapors and fumes, from ambient air through filtration, absorption, adsorption, or chemical reactions on the media contained in the cartridge or filter. 

Powered air-purifying respirator (PAPR) A type of air-purifying respirator that utilizes a battery-powered fan to draw contaminated air through the cartridge or filter into the facepiece. 

The carbon dioxide generated by the personnel in the artificial atmosphere of submarines and spacecraft must be removed from the air and the oxygen recovered. Submarine design teams have investigated the use of potassium superoxide, K02, as an air purifier because this compound reacts with carbon dioxide and releases oxygen (Fig. 4.16) ... 

Titanium dioxide supported gold catalysts exhibit excellent activity for CO oxidation even at temperatures as low as 90 K [1]. The key is the high dispersion of the nanostructured gold particles over the semiconducting Ti02 support. The potential applications of ambient temperature CO oxidation catalysts include air purifier, gas sensor and fuel cell [2]. This work investigates the effects of ozone pretreatment on the performance of Au/Ti02 for CO oxidation. 

Use positive pressure air line with mask or self-contained breathing apparatus for exposure limits and emergency use. Air purifying respirators may not afford an adequate level of protection. 

Use a self-contained breathing apparatus (SCBA). Air purifying respirators (APRs) are not recommended for use in an arsine atmosphere because of poor warning properties and the unknown effectiveness of sorbents used in the filters. 

Metal carbonyls decompose in light to produce carbon monoxide. They are incompatible with strong oxidizers and readily form explosive mixtures with air. Some decompose at ordinary temperatures in contact with porous materials [e.g., activated carbon used in air purifying respirator (APR) filters] and produce carbon monoxide. 

Self-contained breathing apparatuses (SCBAs) or air purifying respirators (APRs) should have a National Institute for Occupational Safety and Health (NIOSH) and Chemical/Biological/Radiological/Nuclear (CBRN) certification. However, during emergency... 

MSA Home Page 2000, Air-purifying Respirators, Conventionally Maintained, Dustfoe Respirator (Pittsburgh, PA MSA International). 

Level C protection should be selected when the type of airborne substance(s) is known, concentration is measured, criteria for using air-purifying respirators are met, and skin and eye exposure are unlikely. It involves a full face piece, air-purifying, canister-equipped respirator and chemical-resistant clothing. This level of protection provides the same degree of skin protection as Level B, but a lower level of respiratory protection. 

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