340 compression ratio

Mine isn’t attached either. It’s a concrete slab with a glorified carport metal building on it. I’ve put some insulation board in there and use a kerosene blow torch that’s pretty loud. About 6” of snow here and teen. I hate it.
But as I sit here and think, I’m thankful I have it. Lots of guys work in the yard or the driveway. At least it’s dry and can be warmed up.