Automatic fire protection sprinkler with extended body

1. An upright fire protection sprinkler, comprising:

a sprinkler body, having an input orifice at an input end of the sprinkler for receiving fluid and an output orifice at an output end of the sprinkler for outputting the fluid, the body having a connection portion at the input end and an extended portion extending between the connection portion and the output end, wherein the extended portion is at least as long as the connection portion;

a pair of frame arms extending from the output end and meeting at a hub positioned in axial alignment with the output orifice, wherein the frame arms are integrally formed with the body; and

a deflector positioned on the hub and configured to direct the fluid output from the output orifice substantially in a direction back toward the output end, wherein the width of the extended portion, measured in a plane perpendicular to a plane passing through the frame arms, is substantially uniform along the length of the extended portion.

2. The upright fire protection sprinkler of claim 1 , wherein the length of the extended portion is at least about 1.2 inches.

3. The upright fire protection sprinkler of claim 1 , further comprising a circumferential groove positioned between the connection portion and the extended portion, the groove constructed to receive a grooved coupling.

4. The upright fire protection sprinkler of claim 3 , wherein the length of the extended portion is at least as long as the connection portion.

5. The upright fire protection sprinkler of claim 3 , wherein the length of the extended portion is at least about 1.2 inches.

6. The upright fire protection sprinkler of claim 1 , further comprising a wrench boss positioned between the connection portion and the extended portion, wherein the connection portion comprises threads.

7. The upright fire protection sprinkler of claim 6 , wherein the length of the connection portion is at least about 1.2 inches.

8. The upright fire protection sprinkler of claim 6 , wherein the wrench boss is positioned substantially closer to the input end than to the output end of the body.

9. The upright fire protection sprinkler of claim 1 , wherein the input orifice has a diameter of 1 inch NPT.

10. The upright fire protection sprinkler of claim 1 , wherein the sprinkler has a K-factor of about 16.8 or greater.

11. The upright fire protection sprinkler of claim 1 , wherein the sprinkler has a K-factor of about 19.6 or greater.

12. The upright fire protection sprinkler of claim 1 , wherein the sprinkler has a K-factor of about 25.2 or greater.

13. The upright fire protection sprinkler of claim 1 , further comprising a release mechanism positioned between the hub and a seal cap to hold the seal cap in place over the output orifice.

14. The upright fire protection sprinkler of claim 13 , wherein the release mechanism comprises a fusible link.

15. The upright fire protection sprinkler of claim 13 , wherein the release mechanism comprises a frangible bulb.

16. The upright fire protection sprinkler of claim 1 , wherein the length of the extended portion is predetermined and a region of lower output density below the sprinkler is defined based on a shadow angle of the fluid output impinging on an outer edge of the extended portion at the output end of the extended portion, wherein the shadow angle is defined as the angle between the axial direction and a line between the outer edge of the extended portion at the output end and a vertex at the intersection of the hub and the deflector.