When using in a room with the gas stove and gas fan heater closed, ventilate once or twice an hour (1 to 2 minutes). Without ventilation, carbon monoxide poisoning can occur, leading to fatal accidents.
Ventilation can be done efficiently by providing two or more openings (with wind in and out). Even if you use a ventilation fan, you may not be able to provide sufficient ventilation unless you open the window away from the ventilation fan.
Do not expose your body to warm air for a long time. Do not sleep in a place exposed to warm air.
Continuous exposure to low-temperature winds can cause poor physical condition, health problems, and low-temperature burns. When used by infants, the elderly, the sick, etc., please be careful of those around you.