Your roommate's concern about the hair dryer potentially starting a fire when left hanging on a metal rack near the shower curtain is not entirely unfounded. While it may not be very likely to cause a fire in most situations, there are certain factors that could increase the risk.
Here's why your roommate might be cautious:
Electrical faults: Hair dryers, like any electrical appliance, have the potential for electrical faults. If there is a problem with the wiring, plug, or internal components, it could lead to overheating and possibly cause a fire.
Heat generation: Hair dryers generate heat during operation. If the hair dryer is still hot when placed on the metal rack, it could transfer some of that heat to the rack. If the metal rack is in direct contact with or very close to flammable materials like the shower curtain, it could create a fire hazard.
Combustible materials: If there are other flammable items or substances in the area (e.g., aerosol sprays, paper products, towels), they could catch fire if exposed to high temperatures.
Ventilation: If the bathroom has poor ventilation, it may lead to the accumulation of hot air and humidity, increasing the risk of fire.
To reduce any potential risk, consider the following precautions:
Cooling down: Before hanging the hair dryer on the metal rack, allow it to cool down completely after use.
Distance: Make sure the hair dryer is positioned at a safe distance from any flammable materials, including the shower curtain.
Proper storage: Consider storing the hair dryer in a designated place away from potential hazards, such as on a non-metallic hook or shelf.
Check for damage: Regularly inspect the hair dryer for any signs of damage or wear. If you notice any issues, stop using it and have it repaired or replaced.
Bathroom safety: Ensure your bathroom has proper ventilation to disperse hot air and humidity effectively.
While it might not be a common occurrence, it's always better to err on the side of caution when it comes to fire safety. Taking these precautions can help reduce the risk of any potential fire hazards in your living space.