Hvac Filters – A Proper HVAC System and Indoor Air

Hvac Filters – A Proper HVAC System and Indoor Air

The filter inside your HVAC system has two jobs. It stops unwanted contaminants from entering the tubes and passing within the internal components, namely the coils. The 2nd job would be to clean the environment by getting rid of dust and airborne contaminants which enhances the indoor quality of air. Modern structures are built to reduce natural ventilation simply because they seal all of the construction cracks and gaps. Perhaps you have observed lots of dust within your house or office? Maybe smells and smells linger more than you would like them to? Let us talk filters.

Filter Rankings

Any filter you purchase may have something known as a MERV Rating. MERV means Minimum Efficiency Confirming Values. The MERV rating is definitely an industry-standard system for rating the minimum efficiency of hvac filters. The MERV rating is really a scale from 1 to twenty, with 1 to be the least effective designation and 20 the very best. A really economical abs plastic filter might have a MERV rating of three or four, and just traps the biggest of airborne contaminants which is harmful to the HVAC system and also the indoor quality of air. A far more efficient filter having a MERV rating of 20 will trap just about all contaminants. Because the MERV rating increases, the same is true the filter effectiveness. If you are in to the more formal definition, here you decide to go:

MERV 20 Particle Size Strained =

MERV 16 Particle Size Strained = .3 – 1. microns Utilized in Operating Rooms

MERV 12 Particle Size Strained = 1. – 3. microns Utilized in High End Residential

MERV 8 Particle Size Strained = 3. – 10. microns Utilized in Average Commercial

MERV 4 Particle Size Strained = >10. microns Filters out small rocks

Residential Filters

Most home HVAC systems often make use of the lower finish filters, MERV 4 approximately. While fundamental essentials least expensive, they really do nothing more than stop pollen, dustmites and carpet materials. Possibly you’ve observed dust accumulating around the horizontal surfaces of your house. Unless of course you retain your home windows open a great deal, the dust is an unwanted effect of poor HVAC filtration. If you wish to reduce the quantity of dust, step up to and including MERV 10 approximately.

A good way to choose your filter is as simple as knowing what you would like to filter from the air. Some good examples are:

MERV five to six – Lint & Heavy Dust Contaminants

MERV 8 or 10 – Settling/Average Dust Contaminants, Mold Spores, Dust Mite Debris, Pet Dander, Pollen

MERV 11 – Suspended/Fine Dust Contaminants, Mold Spores, Dust Mite Debris, Pet Dander, Pollen, Auto Pollutants

MERV 12 – Suspended/Fine Dust Contaminants, Mold Spores, Dust Mite Debris, Pet Dander, Pollen, Auto Pollutants, Bacteria

MERV 13 – Suspended/Fine Dust Contaminants, Mold Spores, Dust Mite Debris, Pet Dander, Pollen, Auto Pollutants, Bacteria, Sub-Pollen Contaminants, Pollution, Most Infections

Subdue the longing to change your filter beyond MERV 12. The provision fan for the HVAC system might not have the ability to overcome the resistance (pressure drop) these filters require. Keep in mind that the resistance from the filter will continuously increase because it will get dirty that will lower your systems ventilation. A great test would be to appraise the air temperature at among the supply registers before you decide to upgrade the filter. Then take away the filter and appraise the temperature while there’s no filter installed. Compare it towards the first measurement. The 2 temps ought to be very close. The final area of the test would be to appraise the temperature after setting up your brand-new filter. If there’s a big change beyond 3 levels, you will need to monitor the HVAC systems performance and note whether it still warms or cools your house adequately.

Kinds of Filters

How big the fan inside your HVAC system determines the optimum filter type you are able to install. The correct filter for the furnace will increase the contaminants taken off the environment and reduce the loss of efficiency. Here are typically the most popular kinds of hvac filters along with a description.

Dust Filter: Normally not utilized in residential programs because of pressure drop, Dust filters are some of the most effective filters available on the market. They operate in an efficiency rate well over 99 % and take away many of the bacteria, most cigarettes, oil and sneeze tiny droplets in mid-air.

Charcoal Air Conditioning Filter: This can be a filter with carbon deposited within the blocking media. Also called triggered carbon filter. Charcoal filters are perfect for removing smells triggered by cigarettes, chemicals, and gases.

Pleated Filter: The pleated filter is the greatest filter for many residential programs. It’s a wise decision for effectively getting rid of contaminants in the air. The filter materials are pleated, or folded, to be able to increase its overall area and therefore trap more contaminants. The pleats will even boost the existence from the filter.

Electrostatic/Electronic Filter: Electrostatic filters are usually provided being an upgrade by collecting a brand new air handling unit. They are an easy way to enhance quality of air without lowering the efficiency of the fan. Essentially an electrostatic area is created over the filter which draws in airborne contaminants. This is comparable to the bug zapper you may have inside your backyard. Because the filter materials are relatively thin, air flow reduction triggered by electrostatic filters is minimal.

Bag Filters: This kind of filter sits dormant in residential programs. It’s set up in a rack which houses multiple bags of filter media. The baggage are available in various MERV rankings making this great for hospitals or high-finish commercial programs.

Useful Features

There are also filters with sodium bicarbonate (Arm & Hammer), antimicrobial qualities, pre-filter pad or odor control qualities. While these functions don’t effect the MERV rating, they may be used to boost the filter’s effectiveness.


About Alan V. Ricotta Sr.

Barbara Ricotta is the owner of Ricotta Heating & Air, a family run business serving the metropolitan St. Louis area for over 50 years.
This entry was posted in 24 Hour (24/7) AC Repair Service, Air Conditioning / Air Conditioners, Central Air Conditioning Units, Emergency Heating / Air Conditioning Repairs, Heating and Cooling Maintenance, Home AC Repair / Maintenance, Indoor Air Quality Specialists, Residential / Commercial Furnaces, St. Louis, Missouri, Ventilation and tagged , , , , , , , . Bookmark the permalink.

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