Why ventilation is needed




















This leads to musty smells, damage to the fabric of the house and it can even result in health problems. Introducing adequate ventilation, with a condensation control unit, gently ventilates the home from a central position such as the landing to transform a stagnant and stale atmosphere into a fresh, healthy and condensation free environment.

If a home does not have an adequate ventilation system and humidity is high, this can provide a perfect breeding grounds for dust mites. These dust mites and their airborne detritus thrive in homes that are not effectively ventilated.

When their detritus encounters the skin or is inhaled, it can cause allergic reactions, resulting in asthma attacks, eczema, watering eyes, itching, sneezing and a runny nose.

These issues can be significantly reduced with an effective ventilation system and some asthma sufferers have seen immediate benefits when such a system has been fitted in their homes. In the summer, hay fever causes misery and suffering for many people. An effective ventilation system can filter out larger particles, such as pollen, preventing them from entering the home. Having a ventilation system in place means there is no need to open the window, which can cause a problem for those with pollen allergies.

A ventilation system could be the answer to a more comfortable summer. Some sufferers of seasonal health conditions, such as hay fever and pollen allergies, have noticed improvements in their condition when an effective ventilation system is fitted.

A constant supply of filtered fresh air entering the home can help to control pollutants in the indoor atmosphere, which can have a positive impact on health.

Some parts of the country are affected by Radon gas. This is a colourless, odourless radioactive gas, which is formed by the decay of small amounts of uranium that occur naturally in all rocks and soils.

Radon is mainly found in areas with high levels of granite and other igneous rocks and is prevalent in areas such as the South West and the East Midlands. Negative pressure in the workplace increases resistance on the ventilation system causing it to move less air.

Air will also enter a building through cracks around doors or windows or other small openings to try to "equal" the rate of air being removed. The result is that workers may be exposed to cold air in the winter, and additional heating costs may occur. One way to figure out if a room is under negative pressure is to open the door about 3 millimeters and hold a smoke tube or another object that releases smoke in front of the opening. If the smoke is drawn into the room, the room is under negative pressure.

If the smoke is pushed away from the room, the room is under positive pressure. If the smoke raises straight into the air, then the pressure in the room is the same as the outside pressure. Another way to judge if a building is under excessive negative pressure is to open a door that pushes towards outside.

If you have to pull or push from inside hard to open the door, the building is under negative pressure the outside pressure is higher than inside, and forces the door shut. A separate intake fan, located away from the exhaust fans, should be used to bring in fresh, uncontaminated air from outside. This air must be clean and heated in winter or cooled in summer, as needed.

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OSH Answers Fact Sheets Easy-to-read, question-and-answer fact sheets covering a wide range of workplace health and safety topics, from hazards to diseases to ergonomics to workplace promotion.

Search all fact sheets: Search. Type a word, a phrase, or ask a question. Introduction Units and Measures Ducts Fans Hoods Air Cleaning Devices Installation and Maintenance general Troubleshooting Glossary of Common Terms The above documents do not cover indoor air quality and general ventilation as used in offices, homes, and other non-industrial settings.

Other ways to control contaminants include: eliminate the use of the hazardous chemical or material, substitute with less toxic chemicals, process change, or work practice change. There are four purposes of ventilation: Provide a continuous supply of fresh outside air. Maintain temperature and humidity at comfortable levels. Reduce potential fire or explosion hazards. Remove or dilute airborne contaminants. The exhaust system consists of: an "air intake" area, ducts to move air from one area to another, air cleaning device s , fan s to bring in outside air and exhaust the indoor contaminated air, and discharge stacks.

The Industrial Ventilation series of documents discusses the elements of the exhaust system. There are two types of mechanical ventilation systems used in industrial settings: General industrial ventilation reduces the concentration of the air contaminants, or controls the amount of heat that accumulates in hot industrial environments, by mixing diluting the contaminated air with fresh, clean, uncontaminated air. When used to control chemical pollutants, dilution must be limited to only situations where: the amounts of pollutants generated are not very high, their toxicity is relatively moderate, workers do not carry out their tasks in the immediate vicinity of the source of contamination, and the emission rate of contaminants is relatively uniform.

Ventilators are breathing machines that help keep your lungs working. Ventilators can be lifesaving and an important part of treatment support for babies, children, and adults. How long you use a ventilator depends on how long you need help breathing or how long it takes for your underlying condition to be treated. Some people need a ventilator for short-term care. Others may need it long term. You, your doctor, and your family can decide whether using a ventilator is best for you and your health.

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Control impurities You may think that the air quality where you live isn't great, especially if you live in a bustling city centre, but in many cases, the air inside can be more polluted than the air outside. A good ventilation system will help expel a build-up of pollutants, bacteria, moisture and unpleasant odours, such as body odour. Air regulation Unless you have a good ventilation system in place, you have no control of the air flow in your building.

Too much fresh air can mean costly energy bills, which is why good ventilation helps control the air, while regulating to the required health and safety levels. Stop condensation Condensation can lead to mould and rotten surfaces - which, naturally, is something you would want to avoid.



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