DIY cleaning is possible, but professionals ensure thorough soot removal and check for hazardous creosote buildup.

You should never block both the top and bottom of your chimney. Proper airflow is essential because the temperature inside the chimney will still fluctuate as your house warms and cools. Moisture can build up without ventilation, leading to dampness in your walls over time. Blocking the top prevents debris and animals from entering, but the chimney still needs air circulation to avoid condensation issues. Allowing the chimney to breathe maintains the health of your home and prevents long-term damage.

You should have either an ABC or K-rated fire extinguisher in the kitchen. ABC fire extinguishers put out wood, trash, paper, plastic, and textile fires along with grease, oil, gas, kerosene, and electrical fires. A class K fire extinguisher is specifically rated for use in the kitchen and is designed to extinguish combustible cooking materials, including grease and fat. 

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.