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File:Коефициенти на защита - филтриращи респиратори с цяла лицева маска.jpg

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Русский: Коэффициенты защиты респираторов с полнолицевыми масками
English: Negative pressure full face masks with HEPA filters. Measurement of protection factors of negative pressure full face masks with high-efficiency filters in the laboratory revealed a risk of decrease in protective properties to a small values. Therefore, the use of such respirators has been limited to the values 50 or 100 PEL in the United States. However, the experts in the UK believed that the quality of their masks is higher than American masks, and were allowed to use up to 900 OEL. But the study (Tannahil et al) showed that the value of the protection factor of > 900 has been achieved in practice infrequently. Minimum protection factors of 3 different models of full facepiece respirators were 11, 18 and 26. So, the new standards limit usage of these respirators up to 40 OEL in UK (after this study).
Български: Измерване фактори на защита на цяла лицеви маски с високо ефективна филтри в лаборатория показват, че рискът от намаляване на защитните свойства на малки стойности. Следователно, използването на такива респиратори е ограничена до 50 ГС или 100 ГС в САЩ. Въпреки това, експертите във Великобритания смятат, че качеството на техните маски са по-високи от американските маска, и е било позволено да го използвате до 900 ГС. Но изследванията показват, че стойността на коефициента на защита > 900 постигнато на практика рядко. Минимални коефициенти за защита на 3 различни модели на цяла лицеви маски са 11, 18 и 26. Така че, най-новите стандарти за ограничаване на използването на тези респиратори до 40 ГС във Великобритания (след това проучване).
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