Yes, you need to leave your chimney damper open when burning a creosote log so that smoke and other debris doesn’t waft into your house as it’s burning. You’ll need to make sure your damper is fully open, even when the log continues to smoke, until it’s completely out and cold.

Asbestos has many beneficial properties, including fire resistance, strength, and chemical resistance. It is also an excellent insulator, which is why it was used in pipe insulation and other building materials for decades. For all its benefits, asbestos is dangerous for human health, which is why it was eventually banned from use in certain products.

Generally, an oil furnace is considered safer than a gas furnace for several reasons. While both types of furnaces can produce carbon monoxide, a leak in an oil furnace is easier to detect due to the smell. Oil furnaces also don't connect to a gas pipeline, which reduces the chance of a fuel leak. Most importantly, heating oil is not combustible, whereas natural gas is highly flammable. This means there is a much lower risk of combustion or explosion with an oil furnace. However, an oil furnace can still pose a fire hazard if it tips over.

No material is genuinely fireproof, so there’s no genuinely fireproof safe. Any material would break down if exposed to a hot enough temperature for long enough. That said, safes can withstand certain house fires. Manufacturers use the term “fireproof” synonymously with “fire resistant.”