Air curtain device

1. A portable device adapted to be worn by a human user for producing a flow of air across a face of the user comprising:

(a) a support means adapted to be worn by a user on a head, neck or shoulder; and

(b) an adjustable air flow means for generating and directing a flow of air across a face of the user to divert airborne particles and chemicals away from the face of the user, said air flow means affixed to said support means thereby making the device portable,

wherein said air flow means has a means for generating a flow of air,

wherein said support means is head gear on which said directing means and said generating means are affixed, and

wherein said support means has a boom, said boom being affixed at one end to said head gear, and said generating means affixed to the other end of said boom, said directing means being cowling attached to an outlet of said generating means.

2. The device of claim 1 wherein the flow of air across the face of the user is greater than or equal to 10 cubic feet per minute.

3. A device for producing a flow of air across a human face comprising:

(a) a means for generating a flow of air;

(b) a means for directing and adjusting said flow of air from said generating means across the face of said human to divert airborne particles and chemicals away from the face of said human; and

(c) a support means adapted to be worn by a user and attached to said generating means thereby making said device portable,

wherein said support means is head gear on which said directing means and said generating means are affixed, and

wherein said support means has a boom, said boom being affixed at one end to said head gear, and said generating means affixed to the other end of said boom, said directing means being cowling attached to an outlet of said generating means.

4. The device of claim 3 wherein said generating means is a fan with a power source or a canister of air.

5. The device of claim 4 wherein said power source is a battery, a solar cell, or a winding spring.

6. The device of claim 3 wherein said head gear is a hat or a headset.

7. A device for producing a flow of air across a human face comprising:

(a) a headset adapted to be worn by a human;

(b) a fan mounted on said headset, said fan having an inlet and an outlet for air;

(c) tubing affixed to said outlet of said fan to direct and adjust a flow of air generated by said fan from the side of a face across the face of said human to divert airborne particles and chemicals away from the face of said human,

wherein said fan and said tubing are affixed on said headset, and

wherein said headset has a boom, said boom being affixed at one end to said headset, and said fan affixed to the other end of said boom, said tubing being cowling attached to an outlet of said fan.

8. The device of claim 7 further comprising a detector mounted to said tubing to detect particles or chemicals other than air having entered an area around and in said flow of air; and said detector producing a signal upon detecting the presence of said particle or chemical other than air.

9. The device of claim 7 further comprising an air conditioning unit affixed to said fan, said air conditioning unit being a dehumidifier, a radiation source or a fragrance source.

10. The device of claim 7 wherein said flow of air across said face is at an angle of less than 90° to more than 0° where 90° is normal to a plane across said face and 0° is parallel to said plane.

11. The device of claim 7 wherein said cowling is flexible cowling to allow for adjustment of said flow of air in direction and/or cross section.

12. The device of claim 7 wherein said cowling has one or more outlet jets to allow for adjustment of said air flow across said face.

13. The device of claim 12 wherein said outlet jets are adjustable to create one or more flows of air across said face.