We have discussed before Whe ther lithium battery fans can be brought on board airplanes.Fans with built-in lithium batteries ≤100Wh can be carried in both carry-on and checked baggage on most airlines. This includes common handheld or neck fans with non-removable batteries.

Recap of Fan Regulations

Carry-on vs. Checked Baggage

Batteries >100–160Wh require prior airline approval. For example, Japan Airlines (JAL) and ANA permit fans up to 160Wh with advance notice.
Batteries >160Wh are strictly prohibited on all flights due to fire risks.

Spare/backup batteries (even for compliant fans) must be in carry-on luggage only per international aviation rules. Checked baggage is not allowed for loose batteries.

Battery Limits

Most handheld fans (10–50Wh) comply with limits. For reference:

    Warmco 10,000mAh neck fan ≈ 50Wh.

    Warmco 5,000mAh handheld fan ≈ 25Wh.

Always check labels for watt-hour (Wh) or milliamp-hour (mAh) ratings. Unmarked batteries may be confiscated at security.

Consumer Tip: Calculate Watt-Hours

Use the formula: Wh = (mAh × V) / 1,000.

    Example: A fan with a 10,000mAh battery and 3.7V voltage:

    (10,000 × 3.7) / 1,000 = 37Wh

Airline-Specific Policies for Fan Usage

General Permission

Most airlines (Delta, United, American, Southwest, ANA) allow fans in carry-ons but require stowing during takeoff and landing. Blades must be secured to prevent accidental activation.

Fans should fit under seats or in overhead bins. Budget airlines (e.g., Ryanair) may enforce stricter size limits.

In-Flight Use Restrictions

Usage is permitted only at cruising altitude. During turbulence or low-oxygen situations, crew may suspend use.

Noise restrictions: Fans exceeding ≥30dB (e.g., loud humming) can be prohibited to avoid disturbing passengers.

Safety overrides: Halt use if a fan overheats, emits smoke, or blocks aisles.

International Variations

Middle Eastern airlines (e.g., Emirates, Qatar Airways) may ban fans with liquid/gel cooling components due to liquid restrictions.

Asian airlines (e.g., Singapore Airlines) limit lithium-powered devices to ≤15 per passenger in combined luggage.

Flights from China prohibit batteries >160Wh entirely.

Best Practices for In-Flight Fan Use

Safety Protocols

Monitor Temperature Closely: Lithium-ion batteries in fans can overheat due to cabin pressure changes or physical stress. If your fan feels excessively warm, stop use immediately and notify the flight crew. Thermal runaway (uncontrolled overheating) is a critical risk that can trigger fires in confined aircraft spaces.

Use Certified Accessories: Always pair your fan with original charging cables and adapters. Counterfeit or damaged cables increase short-circuit risks, especially when plugged into in-seat USB ports. For battery-operated fans, ensure terminals are insulated with tape if spare batteries are carried.

Etiquette & Comfort

Noise Control: Select fans with ≤30dB noise ratings. High-decibel humming disrupts cabin quietness, particularly during red-eye flights. Test noise levels pre-flight by holding the fan at arm’s length—if audible, it’s too loud for shared spaces.

Airflow Direction: Avoid pointing fans directly at nearby passengers. Instead, angle airflow toward your torso or face. This prevents blowing dust/debris toward others and respects personal space.

Hydration Support: Continuous fan use accelerates dehydration in dry cabin air. Counteract this by:

    Sipping water hourly.

    Using saline nasal sprays to prevent sinus irritation.

    Applying moisturizer to exposed skin.

Storage During Flight

Secure Moving Parts: Before stowing, lock fan blades (e.g., via built-in locks or rubber bands) to prevent accidental activation in overhead bins or under seats. Loose blades can jam luggage mechanisms or injure baggage handlers.

Accessibility: Keep fans in seat-back pockets or underseat bags, not overhead bins. This allows quick retrieval if crew request deactivation during turbulence.

Safety Risks and Mitigation

Lithium Battery Hazards

Pressure and Temperature Sensitivity: Lithium-ion batteries in fans can become unstable during cabin pressure changes (e.g., takeoff/landing), increasing overheating or thermal runaway risks. This is exacerbated by limited cabin ventilation, which traps heat and may trigger fires. Example: FAA reports show lithium battery incidents on flights rose 42% from 2023–2025, primarily due to pressure shifts.

Physical Damage Risks: Crushed or dropped fans may short-circuit, especially if blades or batteries are exposed. Damaged batteries are strictly prohibited on all flights.

 Emergency Response Protocol

Immediate Actions for Overheating/Smoking:

Disconnect power sources immediately.

Isolate the fan in a fire-resistant bag (if available) or place it on a non-flammable surface.

Notify flight crew—they are trained to handle battery fires using thermal containment bags (e.g., FireSak) or Class D extinguishers.

Preventive Measures:

Use fans with built-in temperature sensors that auto-shut off at 70°C (158°F).

Avoid covering fans while operating to prevent heat buildup .

Consumer Purchasing Guide

Ideal Features for Travel Fans