Air Purifiers

Taking a deep breath and enjoying the fresh air should be possible in every home – and not just in the Swiss mountains. Air purifiers keep the air free from particles, pollen, allergens, bad smells and volatile organic compounds (VOCs).

Allergy sufferers know the restrictions on their everyday life when the air isn't as clean as it should be. With a Stadler Form air purifier, you can see a lasting improvement in your quality of life and start to breathe easy again.

There are various systems with the same aim: removing particles from the air. HEPA filters or electrostatic filters can be used for this; carbon filters are effective in dealing with odours. Air purifiers can be effective in bedrooms, kitchens, living rooms and offices.

Alternatively, an air washer can keep the air clean and humidify it at the same time.



The following video shows the basics of air pollution.



Current air pollution situation

We spend up to 90% of our time indoors. According to the World Health Organization (WHO), the air inside is two to five times more polluted than outside. It reports that, in 2014, approximately 92% of the world's population lived in places where the WHO's pollution level targets were not met.

We inhale 12,000 liters of air every day, that's approximately 15 kg – far more than our intake of food or water. The air we breathe directly influences our wellbeing and health.

Unfortunately, more and more people are suffering from allergies and heart and respiratory diseases caused by air pollution. Today, 20% of the world's population already suffers from allergic diseases, and the trend is growing. Smog alerts (summer and winter smog) are being reported in an increasing number of cities, and the legal limits of particulate pollution are increasingly exceeded.

There are various impurities in the air indoors, which basically fall into one of two categories: particulate and gaseous pollution. Below is a list of possible indoor air impurities:

  • Bad odors (cooking, wet clothes and shoes, pets, etc.)
  • Volatile organic compounds (VOCs)
  • Formaldehyde
  • Ozone
  • House dust mites and their feces
  • Dust
  • Smoke and tobacco
  • Bacteria and viruses
  • Pet hair
  • Pollen
  • Mold (mold spores)


Air quality and allergies

People with allergies suffer from poor air quality in particular. Typical allergy symptoms are: an itchy and congested nose, urge to sneeze, watery eyes, scratchy and swollen throat, coughing and wheezing, tightness in the chest, hives, rashes, and asthma attacks. An air purifier can help allergy sufferers to breathe easily and sleep deeply and restfully, free from symptoms. Allergies can occur for a variety of reasons. Typical allergies (related to air quality) are explained in detail below.

An allergy to pollen is often inherited and is a reaction to one or several types of pollen. The immune system reacts to the proteins in the pollen. Upon inhaling or coming into contact with pollen, the body releases histamine, resulting in an inflammation of the conjunctiva of the eyes or nasal mucous membrane. If a pollen allergy is left untreated for a long time, it may develop into allergic asthma. A physician can make a diagnosis with skin and blood tests. There are various medications to treat the symptoms as well as special desensitization therapies. An air purifier helps to quickly reduce the levels of allergens in indoor air, allowing you to breathe more easily.


Volatile organic compounds (VOCs)

Volatile organic compounds (VOCs) are organic substances that occur in gaseous form in the air. Typical sources of VOCs indoors are bacteria and molds, plastics, building materials, furniture and carpets, as well as cleaning products, and the waste products of smoking. VOCs can trigger a range of symptoms in humans such as headaches, tiredness, sleep disorders, irritation of the respiratory tract, and hypersensitivity reactions. Their symptoms are also summarized under the term "sick building syndrome". Air purifiers like Roger and Roger little can filter these VOCs out of the air. However, the activated carbon filter must be regularly changed as it will eventually become saturated with pollutants. Alongside the use of an air purifier, it is recommended that you determine and eradicate the source of the pollutant.


Different particle sizes

Particulates come in a range of different sizes. Typically, their size is measured in micrometers (μm). One micrometer or micron is one millionth of a meter, i.e. 0.0001 millimeters. The expression "PM" is usually used to define particle size. PM stands for "particulate matter" and is based on the U.S. standard for particulate matter. Imagining particle sizes is not very easy. They are divided into the following rough categories.

  • Large particles: PM 10 = Dust, pollen, mold spores
  • Medium particles: PM 2.5 = Fine dust, large spores, and other organic contaminant particles
  • Small particles: PM 1.0 and smaller = Very fine dust, combustion particles, nanoparticles, bacteria, viruses, and small spores

Important: Particles measuring PM 1.0 or smaller are respirable, meaning they can penetrate the cell membranes of the alveoli (small air sacs in the lungs) and so enter the bloodstream. From the bloodstream, these particles enter vital organs (e.g. the heart), where they can accumulate and make you sick.


Six advantages of optimally purified air

  1. Pollutants are removed from the air and the burden on the human body is reduced: greater wellbeing in everyday life.
  2. Allergic reactions are reduced or avoided completely: people with asthma or allergies can breathe easily.
  3. The air indoors seems fresher and cleaner and is more pleasant to breathe: fresh air for a healthy life.
  4. Tiredness and lack of concentration are reduced: greater efficiency when working and doing hobbies.
  5. The risk of respiratory diseases falls: breathe safely.
  6. Used, sticky air is purified: the air feels fresher, healthier, and no longer smells stale.


Our solution: Stadler Form Roger and Roger little

Stadler Form is a specialist for indoor climate and healthy air at home and the purity of indoor air is an important issue to us. We have been working intensively on the purification of air for years. The results of our research and efforts are the air purifiers Roger and Roger little, which can remove particle and gas pollution from the air with the help of the Dual Filter™. What's special, is the air quality display that is integrated on the front of the air purifiers. It shows the current air quality in the room at a glance. Blue signifies good air quality, orange means medium air quality, and red stands for poor air quality. If Auto mode is activated, Roger and Roger little control the intensity of the fans themselves so that the air always remains perfectly purified. The life span of the filter is 8–12 months and a necessary change is indicated via the integrated filter display. Both air purifiers are manufactured to high quality standards and are easy to clean. The powerful motor ensures great air circulation and thus an excellent cleaning performance.

More about Roger / more about Roger little

The following video shows the cleaning performance of Roger little.



The Dual Filter™ from Stadler Form is a combined particle and gas filter. It has a multilayer construction. A special fleece filter or HEPA filter is responsible for removing particles. A layer of activated carbon adsorbs various gaseous pollutants from the air. The advantage of the filter is that both filters have an even flow-through and thus high quantities of particles and gases are removed. The handling is also very simple: just one single filter needs to be replaced after 8–12 months.


Purchasing an air purifier

Here some important points to consider when buying an air purifier.

CADR stands for "Clean Air Delivery Rate", which helps when comparing air purifiers. The CADR is measured by a laboratory. The recommended room size for an air purifier can be derived from the CADR.

The more frequently the air in a room is circulated per hour, the cleaner the air becomes. For normal air pollution levels, it is enough for the air in a room to circulate three times (the room's entire air volume must circulate through the air purifier three times). For allergy sufferers, we recommend that the air volume circulated five times. The higher the speed setting the air purifier is set to, the more air is circulated per hour. Generally, we recommend running the air purifier continuously instead of just intermittently so that the air in the room is constantly being circulated and cleaned.

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