My dad keeps using a propane gas burners inside our house garage. He keeps the garage closed. And i keep telling him that it is hazardous. For one thing i know, CO2 from this tank can be concealed inside the garage and it could blow up. Any other explanations because my dad is like a mule who believes he knows everything, and nothing will change his mind. So i was just wondering if someone could give me a thurough explanation of why this is bad?