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A respirator assembly has a respirator hood having a front side that includes a visor and a back side that includes an air inlet opening. The respirator assembly also has a shape stable manifold having an air inlet conduit extending through the air inlet opening of the hood and having, within the ho

A respirator assembly has a respirator hood having a front side that includes a visor and a back side that includes an air inlet opening. The respirator assembly also has a shape stable manifold having an air inlet conduit extending through the air inlet opening of the hood and having, within the hood, a plurality of air delivery conduits in fluid communication with the air inlet conduit.

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1. A respirator assembly comprising: a respirator hood having a front side that includes a visor and a back side that includes an air inlet opening;a shape stable air manifold having an air inlet conduit extending through the air inlet opening of the hood and having, within the hood, a plurality of

1. A respirator assembly comprising: a respirator hood having a front side that includes a visor and a back side that includes an air inlet opening;a shape stable air manifold having an air inlet conduit extending through the air inlet opening of the hood and having, within the hood, a plurality of air delivery conduits in fluid communication with the air inlet conduit;wherein the hood is removable with respect to the manifold, wherein a seal is formed between the hood and the air inlet conduit at the air inlet opening, and wherein the plurality of air delivery conduits curve and split such that the plurality of air delivery conduits comprise at least two upper air delivery conduits extending generally over a respective side of a user's head. 2. The respirator assembly of claim 1 wherein each air delivery conduit has an air outlet adjacent the front side of the hood. 3. The respirator assembly of claim 1, and further comprising: a head harness within the hood for engaging the head of the user to support the manifold and hood thereon. 4. The respirator assembly of claim 1 wherein the hood is non-shape stable. 5. The respirator assembly of claim 1 wherein the air delivery conduits of the manifold are symmetrically disposed relative to the air inlet conduit. 6. The respirator assembly of claim 1, and further comprising: a supply of breathable air in fluid communication with the air inlet conduit of the manifold. 7. The respirator assembly of claim 1, wherein the manifold includes a juncture area where the two air delivery conduits split, and the juncture area comprises an opening. 8. The respirator assembly of claim 7, wherein the manifold comprises a valve member to selectively open and close the opening. 9. A respirator hood assembly comprising: a respirator hood having an air inlet opening therethrough; anda shape stable air manifold removably disposed relative to the hood, the manifold having an air inlet conduit extending through the air inlet opening of the hood and having, within the hood, a plurality of air delivery conduits in fluid communication with the air inlet conduit;wherein a seal is formed between the hood and the air inlet conduit at the air inlet opening, and wherein the plurality of air delivery conduits curve and split such that the plurality of air delivery conduits comprise at least two upper air delivery conduits extending generally over a respective side of a user's head. 10. The respirator assembly of claim 9, further comprising a head harness removably disposed within the hood for engaging the head of the user to support the hood thereon and connected to the air manifold. 11. The respirator assembly of claim 9 wherein each air delivery conduit has an air outlet adjacent a face of the user. 12. The respirator assembly of claim 9 wherein the air delivery conduits of the manifold are symmetrically disposed relative to the air inlet conduit. 13. The respirator assembly of claim 9 wherein the hood is non-shape stable. 14. The respirator assembly of claim 9, and further comprising: a supply of breathable air in fluid communication with the air inlet conduit of the manifold. 15. A shape stable air manifold for a respirator hood that has an air inlet opening therethrough, the shape stable air manifold comprising an air inlet conduit extending through the air inlet opening of the hood and a plurality of air delivery conduits in fluid communication with the air inlet conduit, each air delivery conduit having an air outlet disposed within the hood, and wherein the air inlet conduit is configured to form a seal between a respirator hood and the air inlet conduit, and wherein the plurality of air delivery conduits curve and split such that the plurality of air delivery conduits comprise at least two upper air delivery conduits extending generally over a respective side of a user's head. 16. The manifold of claim 15, and further comprising: a head harness for support the manifold on a user's head within the hood. 17. The manifold of claim 15 wherein the air delivery conduits are symmetrically disposed relative to the air inlet conduit.