hoosiertransfer-mod-saigevers/desktopRuntime/resources/assets/minecraft/blockstates/furnace.json

{
    "variants": {
        "facing=north": { "model": "furnace" },
        "facing=south": { "model": "furnace", "y": 180 },
        "facing=west":  { "model": "furnace", "y": 270 },
        "facing=east":  { "model": "furnace", "y": 90 }
    }
}