Dehumidifiers and your health
The ideal humidity for human health and comfort is 45-55% RH. Within this range, the growth of mould, mildew and bacteria is greatly limited. High humidity can aggravate conditions like arthritis, rheumatism, allergies and asthma attacks.
Our dehumidifiers have built in air purifiers which can remove airborne dust, pollen, odours, bacteria and viruses. This has a positive impact on your respiratory health and allergies.
Air contains water vapour in varying quantities. Its capacity to do so is related to its temperature – warm air holds more moisture than cold air. When moist air comes into contact with either colder air or a colder surface, the air temperature is reduced and its moisture carrying capacity is also reduced. When the air cools sufficiently it reaches the dew point temperature, at which the moisture carrying capacity has been reduced to the point where the air cannot accommodate the moisture in the form of invisible water vapour. This is when the relative humidity is said to be 100%. Any further cooling will result in some fine water droplets being released and this usually condenses onto the cold surface.
All this moisture increases the likelihood of condensation occurring on the cooler surfaces where the boundary layer of air has lower moisture carrying capacity and higher relative humidity. Where the relative humidity is above 70% the problems associated with mould, mildew & fungus start becoming more noticeable. Mould spores become airborne and many people have allergies and poor health as a result of the presence of mould, mildew & fungus. Condensation is generally noticeable where it forms on non-absorbent surfaces (i.e. windows or tiles) but it can form on any surface and it may not be noticed until mould growth or rotting of material occurs.
*MILD DAMP – Space feels mildly damp, increased risk for mould & dust mites, isolated damp problems, condensation droplets may appear.
*MODERATELY DAMP – Space feels damp, condensation droplets may appear, has a musty odour only in humid weather.
*DAMP – Space feels very damp and has a musty odour, especially in humid weather. Damp spots may appear on walls and floor.
*WET – Space feels and smells wet. Walls or floor sweat, or seepage is present
*VERY WET – Walls sweat and floor is almost always wet.