Patent ID: 8667960
Filing Date: 2014-03-11
Classification: A42B,A62B,F04D

Abstract:
1. A powered air purifying respirator comprising: a helmet; a radial blower mounted in the helmet, the radial blower including at least an impeller and a scroll having an upper outer surface and a lower outer surface, wherein the radial blower further comprises an inlet disposed at the lower outer surface of the scroll, wherein a cross section of an air passageway of the scroll includes sides corresponding to the upper outer surface and the lower outer surface, the sides having parallel slanted segments and wherein the cross section of the air passageway forms a non-rectangular parallelogram; wherein the radial blower comprises a shaped profile with a first, generally convex side that is disposed next to a concave surface of the helmet and a second, generally concave side that is disposed next to a head of a wearer of the helmet.