Read all instructions before using this heater. 2. Avoid obstructing airflow openings: Clean dust from grille and side openings periodically. If blocked in any manner, the overheat protector will automatically shut the heater off. 3. Do not operate heater when no one is present. 4. This heater is hot when in use. To avoid burns, do not let bare skin touch hot surfaces. Use handle when moving this heater. Keep combustible materials, such as furniture, pillows, bedding, papers, clothes, and curtai