Figure 031_2538. Medical masks: A , 3-layer surgical mask; B , FFP2 respirator; C , respirator with an exhalation valve; D , N95 respirator. - McMaster Textbook of Internal Medicine South Asian Ed.

Figure 031_2538.
Medical masks: A, 3-layer surgical mask; B, FFP2 respirator; C, respirator with an exhalation valve; D, N95 respirator.

Figure 031_2538. Medical masks: A , 3-layer surgical mask; B , FFP2 respirator; C , respirator with an exhalation valve; D , N95 respirator.