Suppose I'll get Cat5e then. But the heater it'll have to be run under (for ~20 feet) can get real hot, so I think it's good if we stick to Plenum. Knowing Cat5e vs Cat6 is negligible (on our ...

These new Cat6 plenum rated Ethernet cables are available in off the shelf lengths ranging from one foot to one hundred feet and are in stock and available for immediate shipment.