VENTILATION

HEPA Filters

Whole-house Duct Mount HEPA Air cleaner with ultraviolet light & photo catalytic filter 

Carbon Pre-filter protects the HEPA filter while removing odors, lint, hair and larger particles.

Long-life, 99.97% HEPA Media Filter removes particles 0.3 micron (1/84,000 of an inch) and larger on the first pass of air, such as atmospheric and household dust, coal dust, insecticide dust, mites, pollen, mold spores, fungi, bacteria, viruses, pet dander, cooking smoke and grease, tobacco smoke particles and more. The HEPA filter becomes more efficient as it becomes dirtier with time.

Unique Photo Catalytic Oxidation Filter (PCO) has a very high surface exchange capability and allows UVC light into the mass of the material — means there is absorption throughout the whole filter instead of just on the surface. The combination of the UVC light and the decomposes organic materials into basic molecules such as H2O and CO2.

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Why Indoor air pollution is a problem?

Indoor Air Pollution and Health

Indoor Air Quality (IAQ) refers to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. Understanding and controlling common pollutants indoors can help reduce your risk of indoor health concerns.

Health effects from indoor air pollutants may be experienced soon after exposure or, possibly, years later.

Immediate Effects

Some health effects may show up shortly after a single exposure or repeated exposures to a pollutant. These include irritation of the eyes, nose, and throat, headaches, dizziness, and fatigue. Such immediate effects are usually short-term and treatable. Sometimes the treatment is simply eliminating the person’s exposure to the source of the pollution, if it can be identified. Soon after exposure to some indoor air pollutants, symptoms of some diseases such as asthma may show up, be aggravated or worsened.

Certain immediate effects are similar to those from colds or other viral diseases, so it is often difficult to determine if the symptoms are a result of exposure to indoor air pollution. For this reason, it is important to pay attention to the time and place symptoms occur. If the symptoms fade or go away when a person is away from the area, for example, an effort should be made to identify indoor air sources that may be possible causes. Some effects may be made worse by an inadequate supply of outdoor air coming indoors or from the heating, cooling or humidity conditions prevalent indoors.

Long-Term Effects

Other health effects may show up either years after exposure has occurred or only after long or repeated periods of exposure. These effects, which include some respiratory diseases, heart disease and cancer, can be severely debilitating or fatal. It is prudent to try to improve the indoor air quality in your home even if symptoms are not noticeable.

While pollutants commonly found in indoor air can cause many harmful effects, there is considerable uncertainty about what concentrations or periods of exposure are necessary to produce specific health problems. People also react very differently to exposure to indoor air pollutants. Further research is needed to better understand which health effects occur after exposure to the average pollutant concentrations found in homes and which occurs from the higher concentrations that occur for short periods of time.

Strategies to Reduce Indoor Air Pollutants

Strategies to reduce pollutant concentrations in indoor air are source control, ventilation, and air cleaning.

The use of air cleaners alone cannot ensure adequate air quality.

Various technologies can be used in air-cleaning devices. Filtration and electrostatic attraction are effective in removing airborne particles. Some air cleaners use ultraviolet light (UV) technology. Ultraviolet germicidal irradiation (UVGI) has been used to kill some microorganisms growing on surfaces.

Whether installed in the ducts of HVAC systems or used in portable air cleaners, most air filters have a good efficiency rating for removing larger particles when they remain airborne. These particles include dust, pollen, some molds, animal dander, and those that contain dust mite and cockroach body parts and droppings.

The appropriate type of particle removal air filter can be chosen by looking at its MERV rating in removing airborne particles from the airstream that passes through it.

True HEPA filters with a MERV between 17 and 19 are defined by the IEST test method as having a minimum efficiency between 99.97 percent and 99.999 percent in removing 0.3 µm particles. A MERV of 20 is rated for 0.1 to 0.2 µm particles. HEPA filters have higher efficiencies for removing both larger and smaller airborne particles.

Reductions in indoor concentrations of cat and dust mite allergens carried on small particles vary from 20 percent with a MERV 7 filter to 60 percent using a HEPA filter. Increasing filter efficiency above a MERV of 11 does not significantly reduce indoor concentrations of animal dander.

In-duct or whole-house air cleaning devices typically are installed in the return ducts of HVAC systems, as shown in Figure 1. The typical furnace air filter is a simple air cleaner that captures particles in the airstream to protect fan motors, heat exchangers, and ducts from soiling. Such filters are not designed to improve indoor air quality, but the HVAC system can be upgraded by using more efficient air filters to trap additional particles. Other air-cleaning devices such as electrostatic precipitators, UV lamps, and gas-phase filters use sorption and chemical reaction and are sometimes used in the ductwork of home HVAC systems. The fans in residential HVAC systems may operate intermittently or continuously. Continuous operation improves air circulation and air cleaning.

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Remember, your filter wasn’t designed to last forever, but you can keep yours running smoothly for longer with proper maintenance and repairs as necessary. We carry a variety of ventilation products to meet your needs. Contact us for details.