So I have a 30k ventfree propane wall heater it’s been in my home for 3 years no issues no co alarms going off fires and so on I recently built a 240sqft addition and moved it to there lines were inspected by fuel company it’s go low oxygen shutoff and thermostat I also have built a fanbox and ran forced air induction throughout the dwelling connected to a thermostat in the living room my question is what is the likely hood I will run into co issues with this system here is a YouTube link displaying the system https://youtu.be/n9J7DVLUADo
If the unit is listed for this type of application and if you followed the manufacturer’s installation instructions, you should be fine. Personally, I do not trust a vent free gas appliance. Make sure you have good carbon monoxide detectors in your home.
Second what Russell said. Also remember CO detectors have expiration dates. These dates are often 5-7 years. Check the expiration date on your detectors and be sure to replace within the time frame.