half mask การใช้

• The filtering half masks provide the required protection for steel plant employees.
• Experts measured protection coefficients of half mask respirators during cutting of old ships.
• (2007 ) The workers used a high-quality half mask respirators; and they were trained.
• The APF for negative pressure half mask respirators are twofold.
• Also shown were ordinary recreational scuba weight belts and diving half masks with elliptical windows.
• This can be mitigated by carrying a standard secondary second stage, and preferably also a spare half mask.
• One of the measurements showed that ordinary low-cost half mask can provide very high protection factor ( 230, 000 ) sometimes.
• He also started to wear a half mask to hide the fact that half of his face was turning ghostlike like Onryo's.
• Why Ann Hould-Ward has given the Piper a gladiator outfit while the ensembles are in medieval dress with half masks is not clear.
• (2002 ) Protection factors of half mask respirators that are not always used ( because of high air temperature ) have been very low.
• However, these conditions may not be available at other workplaces; and therefore the authors recommended do not change the Assigned PF for half mask respirator.
• Since the protection factors in the new studies were large, the author got the high anticipated effectiveness of half masks respirators-no less than 10 times.
• (1995 ) The author carried out a statistical analysis of the results of all studies of half mask respirator ( when they are used without interruption ).
• The workers used different models : part of respirators had forced supply of air from the cleaning unit, and a part was the usual negative pressure half masks.
• The actors were encouraged to forget the weight of their bodies, while using them more than their faces to express themselves, often wearing a full or half mask.
• Consequently, the Assigned PF ) = 10 efficiency respirators will be insufficient, and they are advised to reduce the Assigned PF to 5 for negative pressure half mask.
• This face is similar to the sculpt which lay under the hood of the 12 " figure, with dark hair, and a half mask covering his nose and mouth.
• The results of numerous field tests and analysis, led to the restriction of application limits of filtering facepieces and negative pressure half mask respirators to 10 PEL in US.
• (1991 ) Measurement of protective properties of half mask respirators showed that they are ineffective, and that their protective properties are significantly higher in the laboratory than in the workplace.
• Personal protective equipment is normally used in jobs with silica exposure, however NIOSH discovered that incorrect respirators, a half mask type, was used and did not meet the silica exposure levels.