Flame arrestors for use with a HVAC/R system

1. A heating, ventilation, air conditioning, and refrigeration system comprising: an HVAC component configured to allow a refrigerant to flow therethrough; at least one supply flame arrestor positioned within a supply air stream; and at least one return flame arrestor positioned within a return air stream, wherein each of the at least one supply flame arrestor and each of the at least one return flame arrestor includes a mesh pitch of approximately 0.1 mm to 5 mm.

2. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one supply flame arrestor includes an open area greater than 60%.

3. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one return flame arrestor includes an open area greater than 60%.

4. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one supply flame arrestor comprises a metal mesh.

5. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one return flame arrestor comprises a metal mesh.

6. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one supply flame arrestor comprises a non-flammable fiber.

7. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one return flame arrestor comprises a non-flammable fiber.

8. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one supply flame arrestor comprises a non-flammable porous material.

9. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one return flame arrestor comprises a non- flammable porous material.

10. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the HVAC component comprises an evaporator coil operably coupled to a furnace.

11. The heating, ventilation, air conditioning, and refrigeration system of claim 10 , wherein at least one supply conduit and at least one return conduit are operably coupled to the HVAC component.

12. The heating, ventilation, air conditioning, and refrigeration system of claim 11 , wherein the at least one supply flame arrestor is positioned within the supply air stream by disposing the at least one return flame arrestor within the at least one return conduit.

13. The heating, ventilation, air conditioning, and refrigeration system of claim 11 , wherein the at least one return flame arrestor is positioned within the return air stream by disposing the at least one return flame arrestor within the at least one return conduit.

14. The heating, ventilation, air conditioning, and refrigeration system of claim 11 , wherein the at least one supply conduit comprises a plurality of supply conduits.

15. The heating, ventilation, air conditioning, and refrigeration system of claim 10 , wherein the furnace comprises:

an enclosure;

a fan disposed within the enclosure; and

a heating element disposed within the enclosure;

wherein the heating element is selected from a group consisting of a flame and an electrical heating element.

16. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the HVAC component comprises a fan coil.

17. The heating, ventilation, air conditioning, and refrigeration system of claim 16 , wherein at least one supply conduit and at least one return conduit are operably coupled to the HVAC component.

18. The heating, ventilation, air conditioning, and refrigeration system of claim 17 , wherein the at least one supply flame arrestor is positioned within the supply air stream by disposing the at least one return flame arrestor within the at least one return conduit.

19. The heating, ventilation, air conditioning, and refrigeration system of claim 17 , wherein the at least one return flame arrestor is positioned within the return air stream by disposing the at least one return flame arrestor within the at least one return conduit.

20. The heating, ventilation, air conditioning, and refrigeration system of claim 17 , wherein the at least one supply conduit comprises a plurality of supply conduits.

21. The heating, ventilation, air conditioning, and refrigeration system of claim 16 , wherein the fan coil comprises:

an enclosure;

an evaporator coil disposed within the enclosure;

a fan disposed within the enclosure; and

a heating element disposed within the enclosure;

wherein the heating element comprises an electrical heating element.

22. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the HVAC component comprises a refrigeration unit.

23. The heating, ventilation, air conditioning, and refrigeration system of claim 22 , wherein the refrigeration unit comprises:

an enclosure;

at least one return air intake fan disposed with the enclosure;

at least one supply air channel disposed within the enclosure;

a compressor disposed within the enclosure; and

an evaporator coil disposed within the enclosure;

wherein the at least one return air intake fan is positioned within the return air stream;

wherein the at least one supply air channel is positioned within the supply air stream.

24. The heating, ventilation, air conditioning, and refrigeration system of claim 23 , wherein the at least one supply flame arrestor is positioned in the supply air stream by positioning the at least one supply flame arrestor adjacent to the at least one supply air channel.

25. The heating, ventilation, air conditioning, and refrigeration system of claim 23 , wherein the at least one return flame arrestor is positioned in the return air stream by positioning the at least one return flame arrestor adjacent to the at least return air intake fan.

26. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the refrigerant comprises a flammable refrigerant.

27. The heating, ventilation, air conditioning, and refrigeration system of claim 26 , wherein the flammable refrigerant comprises difluoromethane.

28. The heating, ventilation, air conditioning, and refrigeration system of claim 26 , wherein the flammable refrigerant comprises 2,3,3,3-tetrafluoro-1-propene.

29. The heating, ventilation, air conditioning, and refrigeration system of claim 1 , wherein the at least one supply flame arrestor and at least one return flame arrestor are each configured to force a flame through a plurality of channels.