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Check your local fire code! PVC jacketed cable is for general purpose use. It cannot be used in air returns unless enclosed in conduit. A plenum rated jacket is generally required for use in any area used for air return, many dropped ceilings, air ducts and in public buildings. Fire codes vary from area to area. If unsure which you need, check with your local Fire Marshall.
Note: This RS-449 cable has a fully loaded DB37 male connector at one end and a fully loaded DB37 female connector at the other end. This cable has the proper pairing, shielding, and grounding necessary to meet EIA-449 standards. Most applications require a PVC jacket. A plenum rated jacket may be required in some cases to meet local fire codes.This cable makes use of RS-422 differential signaling per the industry standard for RS-449 over DB37. We also provide a fully-loaded DB-37 Straight-thru Cable that includes pins 1 through 37 and does not use RS-449 pairing.