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A chimney liner isn’t required for an outdoor fireplace; you don’t technically need one if the masonry chimney uses the proper dimensions and is built to code. However, a chimney liner does serve as a protective coating for the flue. Adding a liner could improve performance, safety, and durability. In short, while not necessary, it wouldn’t hurt.

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. 

There are several maintenance tips you should take to ensure your pellet stove's safety and proper maintenance. You should vacuum the ash pan every week to prevent overflowing and clean the stove and surrounding vents every three to four months. It’s also important to get a professional inspection every year and install a carbon monoxide detector close to your stove. Be sure to dispose of hot ashes in a closed metal container; store it outside, away from the house. Only use the pellets recommended by your stove's manufacturer, and follow any cleaning and maintenance instructions.

There aren’t many problems with fire doors except that they slow down or cut off ventilation at the higher rating levels. For this reason, work with a professional to ensure you have adequate ventilation throughout your house or workspace. The sealing around a fire door is meant to allow for a specific amount of ventilation and will need regular inspections to ensure adequate airflow.