Portland ranks high among the worst places for airborne allergies, primarily from trees, weeds, and pollen. Fortunately, the best air filters for your HVAC system reduce the irritations that the widespread proliferation of ragweed pollen causes.
Look for its MERV (minimum efficiency reporting value) rating. The scale runs from 1 to 16 and higher numbers indicate the filter traps smaller particles. Some manufacturers have simplified the scale and label their filters as “good, better, and best.”
Filters with MERV ratings from 1 to 4 are equivalent to the “good” designation. Those rated between 5 and 8 are better, and the highest for residential purposes range between 9 and 12.
Pollen particles are small and will pass through filters with MERV ratings 7 and below. Higher MERV rated filters will capture a higher percentage of these particles. Choose a filter with a better designation or whose MERV rating is 9 or higher.
Words of Caution
Before upgrading the filter for your HVAC system, consult your owner’s manual for the highest rated filter you can use with it. Denser filters slow the air flowing through the air handler and putting a filter inside it that exceeds the manufacturer’s recommendation will raise energy bills and may cause system problems.
Many of the best air filters for allergy relief are pleated. They capture more particles because of their greater surface area and denser weave. Because they’re more effective at trapping particles, they need to be checked and replaced more often than lower rated filters.
Running your system with a dirty filter pulls dustier air through the ductwork, which defeats the purpose of using your HVAC system to control pollen and other airborne allergies. Unless the pollen is trapped at the filter, it can continue to circulate through your home’s air wherever else it lands.
Ductwork, carpet, furniture, and window coverings all hang onto these particulates and when they’re disturbed, your allergies may flare up again.
The best air filters can ease your suffering through allergy season and longer. For more information, contact Roth Heating & Cooling, providing trusted HVAC services for Portland-area homeowners.