Cross flow blower

1. A powered air respirator system comprising:

a facepiece operable to fit onto or over a user's head;

one or more filter operable to filter air to be breathed by the user; and

a cross flow blower operable to supply filtered air to the facepiece, wherein the cross flow blower comprises:

a housing comprising an inlet and an outlet;

rotating impeller blades located within the housing;

a motor operable to power the rotating impeller blades, the motor located within a central portion of the rotating impeller blades; and

a plurality of flow forming blades located within the cross flow blower operable to direct airflow within the cross flow blower, wherein the plurality of flow forming blades comprises:

inlet flow forming blades arranged across the inlet to be substantially tangent to a rotational direction of the rotating impeller blades; and

central flow forming blades located circumferentially around the motor within the central portion of the rotating impeller blades, and wherein the central flow forming blades are positioned at an angle with respect to the rotating impeller blades such that the central flow forming blades block any airflow from leaving the rotating impeller blades back toward the central portion.

2. The powered air respirator system of claim 1 , wherein the airflow crosses through the impeller blades twice before exiting the cross flow blower.

3. The powered air respirator system of claim 1 , wherein the airflow enters and exits the impeller blades radially.

4. The powered air respirator system of claim 1 , wherein the inlet flow forming blades are located between the inlet and the impeller blades, and wherein the inlet flow forming blades are operable to direct airflow from the inlet into the impeller blades.

5. The powered air respirator system of claim 4 , wherein the inlet flow forming blades are operable to block any airflow from leaving the impeller blades back toward the inlet.

6. The powered air respirator system of claim 1 , wherein the central flow forming blades are operable to direct airflow through the impeller blades toward the outlet.

7. The powered air respirator system of claim 1 , further comprising a belt worn by the user, wherein the cross flow blower is attached to the belt.

8. The powered air respirator system of claim 1 , wherein the flow forming blades are attached to the housing.

9. A cross flow blower comprising:

a housing comprising an inlet and an outlet;

rotating impeller blades located within the housing, wherein airflow enters and exits the impeller blades radially;

a motor operable to power the rotating impeller blades, the motor located within a central portion of the rotating impeller blades; and

a plurality of flow forming blades located within the cross flow blower operable to direct airflow within the cross flow blower,

wherein the flow forming blades comprise inlet flow forming blades located between the inlet and the impeller blades;

wherein the inlet flow forming blades are operable to direct airflow from the inlet into the impeller blades and operable to block airflow from leaving the impeller blades back toward the inlet,

wherein the inlet flow forming blades are arranged across the inlet to be substantially tangent to a rotational direction of the rotating impeller blades;

wherein the flow forming blades comprise central flow forming blades located circumferentially around the motor within the central portion of the impeller blades; and

wherein the central flow forming blades are positioned at an angle with respect to the rotating impeller blades to direct airflow through the impeller blades toward the outlet and to block airflow from leaving the impeller blades back toward the central portion.

10. The cross flow blower of claim 9 , wherein the thickness of the housing is approximately 35 millimeters.

11. The cross flow blower of claim 9 , wherein the inlet flow forming blades are attached to the housing.

12. The cross flow blower of claim 9 , wherein the flow forming blades are molded to a top portion of the housing.

13. The cross flow blower of claim 9 , wherein the inlet of the cross flow blower is operable to attach to one or more filter, such that the air that flows through the cross flow blower is first passed through the one or more filter.

14. The cross flow blower of claim 9 , wherein the outlet of the cross flow blower is in fluid communication with a hood or mask worn by a user.

15. The cross flow blower of claim 9 , wherein the cross flow blower is part of a powered air respirator system.

16. The cross flow blower of claim 9 , wherein the airflow crosses through the impeller blades twice before exiting the cross flow blower.

17. A cross flow blower comprising:

a housing comprising an inlet and an outlet;

rotating impeller blades located within the housing, wherein airflow enters and exits the impeller blades radially, and wherein the rotating impeller blades form a circular central portion;

a motor operable to power the rotating impeller blades, the motor located within the circular central portion of the rotating impeller blades;

a plurality of inlet flow forming blades located between the inlet and the impeller blades, operable to direct airflow from the inlet into the impeller blades located within the cross flow blower; and

a plurality of central flow forming blades located circumferentially around the motor within the circular central portion of the impeller blades, the plurality of central flow forming blades operable to direct airflow through the impeller blades toward the outlet,

wherein the plurality of inlet flow forming blades are arranged across the inlet to be substantially tangent to a rotational direction of the rotating impeller blades; and

wherein the central flow forming blades are positioned at an angle with respect to the rotating impeller blades such that the central flow forming blades block any airflow from leaving the rotating impeller blades back toward the circular central portion.