OK, a couple questions and then some general information and precautions.
Is the propane smell the raw propane, nasty stink, or the burnt propane smell, kinda toasty smell?
This may be overkill for your installation but here is what I do when I have a propane appliance. First off get a regulator with a gauge, then when you turn off the appliance and the propane tank you can see if any propane is leaking by looking at the gauge, a leak down test.
Solid copper pipe is the recommended, some folks use a special bulkhead fitting when going through a wall, I will use a rubber grommet if it is passing through metal. Then a shut off valve is a very good idea just before any appliance. Last I use a flex section between the shut off and the appliance because I find I'm always moving stoves or fridges. This flex hose should be date stamped and changed every three to five years. Two reasons, the propane will penetrate and the hose will start to stink and it can lose its strength.
Once you have done all this it is pretty easy to do a quick leak down test. Pressurize the system with all valves open but appliances off. It should hold pressure well. I find that the thermocouple valves in the appliances leak a little. Then do the same test but have the shut off valves closed. You should have zero leakage over a couple hour period. If you have any leakage then do the squirt bottle soapy water test. Squirt some soapy water over the pressurized joints and look for bubbles forming.
Now you should be free of the raw propane smell. If you smell burnt propane, then check the flue. It should be vented outside but if your fridge is a portable, then you should have adequate ventilation. If you burn propane in a closed space and it uses up the oxygen it will not burn clean and produce carbon monoxide from incomplete combustion. This is serious, alway have a window open, even when it is cold outside. Almost lost a friend on a boat because of this, and he was a very experienced off shore sailor.
I know, too much information, yes propane freaks me out.
Rich