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Baking soda is an effective fire reduction method. However, flour and baking powder are very dangerous around flames. Flour is flammable and it can also conduct electricity. The combination can cause serious injury from electrical shock and worsen the situation by adding fuel to the fire. Baking powder is also not an option as it's also highly flammable. 

After a house fire, you should not reenter your home unless the fire crew has told you it’s safe to do so. In the longer term, you should not attempt to make repairs to the house on your own. Professional crews are trained to clean up after a fire (including smoke and soot damage), dry out any water damage from the firefighter crews, and make the necessary structural, plumbing, and electrical repairs—and this is all likely covered by insurance.

To prevent carbon monoxide poisoning on a propane heater, make sure that your heater is suitable for indoor use. When you run the heater, it should always be in a well-ventilated area with proper air circulation. Installing carbon monoxide detectors on every level of your home is also essential. If you have any questions about using a heater indoors, contact a local heating and oil company for more information.

You can fireproof an existing door to some extent, but it's better to remove the old door and replace it with a fire-rated model. Anything dealing with extreme heat needs rigorous testing and a door you DIY fireproof will not undergo the same safety measures as a premade one. Consider a door with a rating of at least 30 minutes or more in residential areas.