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Why humid air is an asset!
Arriving in good shape is a prime concern for anyone travels by air. Airlines respond to this in a number of ways. They offer wide seats, flat beds and in-flight entertainment to help passengers relax. Some also offer internet connection and live TV to help them use their travel time more efficiently. Meanwhile dry air in the cabin remain a concern, especially for frequent travelers, especially on long haul flights.


The dry air

In addition to the many benefits balanced air humidity constitutes in terms of economy, environment, aircraft and safety, it also has significance for the wellbeing of the passengers and health of the personnel. Cair™ has been created to enhance the passengers wellbeing by humidifying the dry cabin air.

Normally the relative indoor humidity in homes and offices is between 50-60%. In an aircraft this drops to 5-15%. This is because half of the air is drawn in by the engines at a height of around 10,000 m where the air is extremely dry. So the longer the flight continues, the drier the cabin air becomes and the more evident the symptoms become for the passengers.



When people are subjected to air humidity lower than 20% they experience a series of different problems. For example sleep disorders, dry eyes, dehydration of the skin and mucous membranes, as well as the fact that food doesn't taste so good in an airplane.

Other discomforts include the need to remove contact lenses, increased likelihood of colds, a greater risk of viral infections, as well as problems with dry skin and allergies. This is particularly wearing for cabin personnel, who are constantly subjected to the dry air. Increasingly longer flights, now with durations up to 18 hours, only aggravate the symptoms.


Feel better

Cair™ humidifies the dry cabin air and alleviates all of the aforementioned problems substantially. The passengers gain more strength and energy and do not feel as tired when they reach their destination.

It is scientifically proven (download report) that passengers feel better with an air humidifier on board. In addition to the enhanced wellbeing of all in the aircraft and improved working environment for the cabin crew, the system has other advantages.



The capacity to be able to offer good air during flights is a strong competitive advantage for airlines. Especially when one considers the growing demands for good levels of cabin comfort. And to be able to offer a flight with minimized environmental effect is yet another competitive advantage.

Our Cair™ system enhance the wellbeing of the passengers, accessibility of the aircraft, and offer the airlines opportunities to simultaneously reduce costs and contribute to a better environment. We call it "Humidity in balance".

The Cair™ System
- Humid air is an asset!
- How it works
- Technical Descriptions
- Applications
- Customers
- Customer Statements
- Certification
- Download Product Sheets
- Articles & Testimonials
Benefits with the Cair™ System
Health Article
Changes in ocular and nasal signs and symptoms among air crew in relation to air humidification on intercontinental flights
CTT Systems AB, Box 1042, SE-611 29 Nyköping, Sweden
Phone: +46 (0)155-20 59 00, Fax: +46 (0)155-20 59 25, E-mail:
ctt@ctt.se