Soaked in as much as I could from Google, and I learned that plenum-rated cables are required for installation through any type of ventilation ducts to prevent toxic emissions due to cable burning. Some people say that for residential applications it doesn’t matter, while others keep pushing for plenum. Thing is, plenum cables cost hundreds of dollars and don’t seem to come in anything shorter than 500 feet (I’d need about 1/20 of that size).
I’m just wondering if anyone has any further opinions about this, particularly if you’ve done it with a regular ethernet cable. I live in Canada so there will be several hours of heating per day during the winter. I won’t be running the cable near the furnace.