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Cabin air

 

A person living at sea level will suffer from lack of oxygen (hypoxia) when the physiological altitude rises above 3,000 m (10,000 ft.). Therefore, cabin air pressure is maintained at a higher level than outside air pressure. Cabin air is pressurised by air from the jet engines. The maximum allowable cabin air pressure may not exceed the pressure at 2,400 m (8,000 ft). During most flights, the cabin pressure altitude remains at 1,500–1,800 m (5,000–6,000 ft.).

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Cabin air circulation


In modern aircraft, only half of the cabin air is removed from the aircraft, the other half is passed through highly effective filters back into the air-conditioning system. Fresh air enters the cabin continually in quantities that are 10–20 times larger than that needed by each passenger and consequently, there is no lack of oxygen in cabin air.

Filters remove all particles larger than 0.3 microns from the air. Research studies have shown that recirculated air does not contain bacteria, viruses or other solid particles. Fresh air enters the cabin through the nozzles located in the ceiling and upper shelves and is removed through the exhaust ports located in the lower portion of the legroom sidewall. Modern air-conditioning techniques prevent the movement of cabin air lengthwise along the aircraft.

Use of recirculated air decreases fuel consumption and makes flying more economical and environment-friendly.

The air pressure in the cabin is the same in all types of aircraft cruising at the same altitude. Typical flight altitudes for jet aircraft vary between 10–12 km (30,000–40,000 ft.), and 5–7 km (16,500–23,000 ft.) for turboprop aircraft. The air pressure in the cabin of turboprop aircraft is higher than in jet aircraft, as they fly at a lower altitude.

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Passengers allergic to animals


Please mention at the time of making your reservation if you are allergic to animals. If an allergic person has reserved a ticket for a certain flight, that flight can be closed to people travelling with a cat or a dog. If, on the other hand, a cat or a dog is already listed in the reservations for a certain flight, we can recommend another flight to the allergic person. Due to effective air-conditioning onboard the aircraft, however, the risk of being exposed to animal allergens is very small.

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Keywords

Cabin air
Air pressure
Air circulation
Allergi to animals


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Sending of username or password is possible only if the mobilenumber or e-mail address is updated in the profile. If your contact information has changed, please contact Finnair Plus Service Center, tel. +358 9 818 888, open Mon-Fri 7am-7pm, Sat 9am-4pm. Other times, Finnair Customer Care Center +358 600 140 140 (24h, in Finland 3,12eur/answered call + local call charge).