I think that's what a Flue Pipe is for...
I was doing this until everybody around me ran out of propane. Got the Mr Heater Buddy. I watched a video of a guy on youtube run it for hours inside a shut RV with a CO detector and the alarm never went off. When I ran it I left a little gap for fresh air to get in. Didn't have any problems. I left it running all night. Didn't die. I think the company says don't do it so they don't get sued.
Yeah, that's what I'm using a mr heater buddy. It says it has a low oxygen automatic shutoff but I got a CO detector too just in case. Thanks, I figured a cracked window and a CO detector will cover pretty much 99% of safety bases. I know CO can be strange as it can make you start hallucinating and stuff before it actually kills you so always erring on the side of caution.
Please don't accidentally kill yourself.
If he's dead, the problem is basically solved.
You're playing Russian Roulette with your life, if you are using a propane heater inside a closed building. Carbon monoxide (monoxide, not dioxide) is a poison gas that replaces oxygen in your red blood cells. The more blood cells the CO deactivates, the less oxygen gets carried to your heart and your brain. You keep breathing, but it doesn't do you any good, and you eventually pass out and don't wake up.
If it's burning clean there is only CO2 and water produced, no need for a vent. Many high efficiency propane space heaters are ventless.
You don't need to vent it
I use a 20k btu wall mounted ventless propane heater. Get a smoke/co detector and an explosive gas detector. Put the gas detector low and near your heater, propane sinks. If you can, the best thing to do it give the heater its own fresh air intake. I don't have it done yet but I plan on making a small hole in the wall just under the heater and using an HVAC vent cover to adjust the draft. As it stands we've been using it all winter with no issue.
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