NaturesAura/src/main/resources/assets/naturesaura/models/block/furnace_heater.json

{
    "parent": "minecraft:block/block",
    "elements": [
        {
            "from": [2, 0, 2],
            "to": [14, 4, 14],
            "faces": {
                "down": {
                    "uv": [0, 4, 12, 16],
                    "texture": "#texture",
                    "cullface": "down"
                },
                "up": {
                    "uv": [0, 4, 12, 16],
                    "texture": "#texture"
                },
                "north": {
                    "uv": [0, 0, 12, 4],
                    "texture": "#texture",
                    "cullface": "north"
                },
                "south": {
                    "uv": [0, 0, 12, 4],
                    "texture": "#texture",
                    "cullface": "south"
                },
                "west": {
                    "uv": [0, 0, 12, 4],
                    "texture": "#texture",
                    "cullface": "west"
                },
                "east": {
                    "uv": [0, 0, 12, 4],
                    "texture": "#texture",
                    "cullface": "east"
                }
            }
        }
    ]
}