Method of assembly and disassembly of abrasive blast respirator

1. A method of assembling a supplied-air abrasive blast respirator, comprising:

removably attaching an exhalation valve into an exhalation valve port of a facepiece;

removably installing the facepiece into a hood;

removably attaching one or more filter to one or more purified air inhalation valve, where the purified air inhalation valve is coupled to the facepiece; and

removably attaching a breathing hose to a supplied air inhalation valve, where the supplied air inhalation valve is coupled to the facepiece; wherein the one or more filter and exhalation valve are located external to the hood;

wherein the hood comprises a mask with openings corresponding to the exhalation valve, one or more purified air valve, and supplied air inhalation valve; and

wherein installing the facepiece into a hood comprises inserting the facepiece into the hood: aligning the facepiece with the mask so that the openings in the mask match with the corresponding exhalation valve, one or more purified air valve, and supplied air inhalation valve; and fitting the facepiece to an inner surface of the mask so that the mask shields portions of the facepiece, while allowing the one or more filter, at least a portion of the exhalation valve, and the breathing hose attachment to the supplied air inhalation valve to be located on the facepiece external to the hood.

2. The method of claim 1 , further comprising removably attaching a protective cover over the filter and the exhalation valve.

3. The method of claim 1 , further comprising removably coupling a lens magazine to the facepiece.

4. The method of claim 3 , further comprising loading the lens magazine with a plurality of separate lenses.

5. The method of claim 4 , wherein loading the lens magazine with a plurality of separate lens comprises inserting a removable tab into each lens, wherein the tab is configured to remove the lens using a gloved hand by a user of the abrasive blast respirator.

6. The method of claim 1 , wherein removably attaching the exhalation valve into the exhalation valve port comprises screwing the exhalation valve into place.

7. The method of claim 6 wherein the exhalation valve comprises a valve cover and an exhalation valve housing, further comprising removably attaching the valve cover to the exhalation valve housing from an outside of the facepiece.

8. The method of claim 1 , wherein the hood is operable to cover a user's head and is formed of a flexible material.

9. A method of disassembling a supplied-air abrasive blast respirator, comprising:

detaching a breathing hose from a first inhalation valve, where the first inhalation valve is coupled to a facepiece of an abrasive blast respirator external to a hood;

detaching a filter from a second inhalation valve, where the second inhalation valve is coupled to the facepiece external to the hood; and

removing the facepiece out of a hood assembly of the abrasive blast respirator.

10. The method of claim 9 , further comprising removing a housing of the exhalation valve from an inside of the facepiece.

11. The method of claim 10 , further comprising cleaning the valve and housing of the exhalation valve and cleaning the breathing hose.

12. The method of claim 9 , further comprising removing a protective cover positioned over the filter and the point of attachment of the breathing hose to the first inhalation valve.

13. The method of claim 9 , further comprising detaching a second filter from a third inhalation valve, where the third inhalation valve is coupled to the facepiece.

14. The method of claim 9 , further comprising removing a lens magazine from the outside of the facepiece.

15. A method of assembling a supplied-air abrasive blast respirator, comprising:

removably installing a full facepiece assembly into a hood, wherein the full facepiece assembly comprises a lens, a face seal, and a head harness;

removably attaching a protective cover to an outside of the full facepiece assembly external to the hood and over a plurality of inhalation valves and an exhalation valve; and

removably attaching a lens magazine assembly to the lens after the full facepiece assembly is installed into the hood.

16. The method of claim 15 , further comprising assembling the lens magazine assembly by

snapping an inner lens to a carrier lens;

snapping a middle lens to the carrier lens over the inner lens; and

snapping an outer lens to the carrier lens over the middle lens.

17. The method of claim 15 , further comprising:

attaching a filter to a first inhalation valve before removably attaching the protective cover to the outside of the full facepiece assembly, where the first inhalation valve is coupled to the lens external to the hood; and

attaching a breathing hose into a second inhalation valve before snapping the protective cover to the outside of the full facepiece assembly, where the second inhalation valve is coupled to the lens external to the hood.

18. The method of claim 15 , further comprising

snapping an exhalation valve housing, a seal, and an exhalation valve together,

fitting the exhalation valve housing into a receiving aperture in the lens from an inside of the lens; and

snapping a valve cover to the exhalation valve housing from an outside of the lens.

19. The method of claim 15 , wherein the hood is operable to entirely cover a user's head and comprises a flexible, abrasion resistant material.