TLDR

• A new study shows that using MERV-13 or higher filters combined with more outdoor air ventilation reduces fine particles (PM2.5) in urban school buildings.
• These improvements also apply to homes and multifamily buildings, helping improve indoor air quality and comfort.
• Homeowners, contractors, and property managers can use this info to upgrade filters, tune ventilation, and plan installations effectively.

A new study released yesterday shows that upgrading to MERV-13 or higher air filters combined with increased outdoor ventilation can significantly reduce fine particulate matter (PM2.5) in urban school buildings. PM2.5 refers to tiny particles that can affect indoor air quality and comfort. These improvements lowered indoor pollution compared to standard systems. While the study focused on schools, the same filtration and ventilation strategies apply to homes and multifamily buildings, offering clear steps for better air quality in many indoor environments.

Standards, codes, and efficiency context you should know

MERV stands for Minimum Efficiency Reporting Value. It measures how well a filter captures particles. Filters rated between 13 and 16 catch fine particles like PM2.5, which are tiny and can affect air quality. Many guidelines recommend using MERV-13 filters to reduce these particles indoors. Local rules also set how much outdoor air a system must bring in, so check with your installer and local codes to be sure you meet requirements. Higher MERV ratings can cause more resistance to airflow, called pressure drop. This doesn’t affect your system’s SEER2 rating, which measures energy efficiency, but it can impact airflow. A professional should check your system’s fan settings and airflow after upgrading filters to keep your system running efficiently and comfortably.

What it means for homeowners, contractors, and PMs

For homeowners, upgrading to MERV-13 filters means better control of fine dust and particles inside your home. You should set a regular schedule to swap out filters to keep air clean and systems running smoothly. Contractors have a clear opportunity to offer upgrades like media filter cabinets, fan tuning, and energy recovery ventilator (ERV) add-ons. Ordering is streamlined with two-click options and live tracking to manage jobs efficiently. Property managers can standardize MERV-13 filters across multiple sites by using bulk order cycles and scheduling deliveries for convenience. Managing these orders and deliveries is easier with a single dashboard designed to keep everything organized and on track.

How MERV-13 and added outdoor air cut PM2.5

PM2.5 are tiny particles smaller than 2.5 micrometers. They often come from outdoor smoke and indoor cooking. MERV-13 filters use pleated media that fits most 1–2 inch filter slots. Using a deeper 4–5 inch filter cabinet lowers airflow resistance and helps the filter last longer. Increasing outdoor air brings more fresh air inside. This can be done with energy recovery ventilators (ERVs), heat recovery ventilators (HRVs), or by adjusting fan schedules. To keep the system efficient, have a professional check static pressure and make sure filter racks are sealed well. This prevents air from bypassing the filter and ensures better air cleaning.

Do this now: pick filters, set airflow, plan logistics

Start by confirming your filter size and the depth of your filter cabinet. If you’re not sure, you can use our sizing tool to get the right measurements in seconds. Next, choose the upgrade path that fits your needs: the Good option is a MERV-13 pleated filter, which fits most standard slots. The Better option uses a 4–5 inch deep MERV-13 filter cabinet, reducing resistance and extending filter life. The Best option combines an energy recovery ventilator (ERV) with MERV-13 filters for maximum air quality and ventilation. Finally, coordinate your installation and delivery with your contractor or team. We can help stage shipments by site and date to make the process smoother. Planning ahead ensures your upgrades go in quickly and efficiently.

Key Takeaways

• Upgrading to MERV-13 or higher filters combined with increased outdoor air ventilation significantly reduces fine particulate matter (PM2.5) indoors. PM2.5 refers to tiny particles that can come from outdoor smoke and indoor cooking, affecting air quality and comfort.
• The study focused on urban school buildings but the same filtration and ventilation improvements apply equally to homes and multifamily buildings for better indoor air quality.
• MERV stands for Minimum Efficiency Reporting Value; filters rated 13 to 16 capture fine particles effectively without affecting system efficiency when properly installed and airflow is checked.
• Homeowners get cleaner air and less dust, contractors can offer clear upgrades and add-ons, and property managers benefit from standardizing filtration and ventilation to maintain healthier buildings.

Frequently Asked Questions

What does MERV-13 mean and why is it important for indoor air quality?

MERV stands for Minimum Efficiency Reporting Value, which rates how well a filter captures particles. MERV-13 filters trap fine particles like PM2.5, which are tiny and can affect air quality. Using MERV-13 or higher helps reduce indoor pollution and improve comfort.

How does increasing outdoor air ventilation help reduce indoor PM2.5?

Bringing in more outdoor air dilutes indoor pollutants by replacing stale air with fresh air. When combined with MERV-13 filters, this reduces fine particulate matter (PM2.5) inside buildings, leading to cleaner, healthier air.

Can the filtration and ventilation improvements used in schools work for homes and apartments?

Yes. The same principles apply to homes and multifamily buildings. Upgrading to MERV-13 filters and increasing outdoor air ventilation can lower indoor PM2.5 levels across different building types, improving air quality and comfort.

Will using higher MERV filters affect my HVAC system’s energy efficiency?

Higher MERV filters can increase resistance to airflow, which may affect fan performance. However, this does not change your system's SEER2 energy rating. A professional should check airflow and fan settings to maintain efficiency and protect your system.

Related Topics: MERV-13 filters, ventilation, PM2.5 reduction, indoor air quality, HVAC maintenance, home comfort, air filtration, outdoor air ventilation, energy efficiency, heating systems, air conditioning, HVAC parts