"Filter number" most commonly refers to the exact part or model number of a replacement filter (such as for your car, furnace, water pitcher, or vacuum).
#4 filters are larger, designed for 8-12 cup coffee makers. #2 filters are smaller, fitting 1-6 cup brewers or single-serve devices. Choosing correctly impacts your coffee's taste.
No, a MERV 11 filter is typically not too high for a home. It is widely considered a "sweet spot" for residential use, providing excellent filtration against pet dander, pollen, and dust mites without severely restricting airflow in most properly sized, healthy systems.
Filter thickness determines how much surface area is available to capture particles and how long your filter will last—a 4-inch filter has nearly 4x the filtration capacity of a 1-inch filter, meaning better air quality and fewer replacements.
Best filtration: MPR 1500 to 2800
These premium filters excel at capturing microscopic particles, including allergens, bacteria and viruses.
A good MERV (Minimum Efficiency Reporting Value) rating for residential HVAC systems is typically between 8 and 13. MERV 8 filters capture basic particles like dust, pollen, and pet dander and are adequate for most households.
What micron rating do I need for a whole house water filter? For city water with normal sediment levels, a single 5–10 micron whole house cartridge is sufficient. For well water or homes with older iron pipes, use a 20–50 micron coarse filter as the first stage and a 1–5 micron filter as the second stage.
Yes, thicker air filters are generally better because their deeper pleats offer significantly more surface area. This increased surface area means they last longer, hold more dust without choking your system, and restrict airflow less than thin filters of the exact same density.
Even the least powerful air filter will prevent a substantial amount of dust from entering your HVAC system and circulating throughout your home. (Usually MERV 1-4). Pollen, dust mites, and mold: Allergy sufferers should look for filters that trap these contaminants (usually MERV 5-8).
Choosing between a MERV 8 and MERV 11 air filter comes down to balancing your indoor air quality needs with your HVAC system’s airflow capacity.
Yes, MERV 11 filters effectively trap airborne mold spores. They are designed to capture particles ranging from 1 to 10 microns—the exact size of most mold spores—significantly improving your indoor air quality by preventing them from circulating through your HVAC system.
A MERV 13 filter can potentially strain or damage your furnace. While these filters trap microscopic allergens, their dense material can severely restrict airflow, leading to a burned-out blower motor or a cracked heat exchanger.
For standard residential homes, a MERV 8–10 filter is typically sufficient to trap common pollutants like dust, pollen, and pet dander. For homes with allergy sufferers or where air quality is a higher concern, consider upgrading to a MERV 11–13 filter.
The most common standard furnace filter size is 20" ×cross× 25" ×cross× 1". Other highly common standard sizes include 16" ×cross× 25" ×cross× 1", 16" ×cross× 20" ×cross× 1", and 20" ×cross× 20" ×cross× 1".
If you're struggling money wise get one 16x25x1. But that is going to need changed more often and doesn't allow as much airflow as a 4” would.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
No, a MERV 11 filter is typically not too high for a home. It is widely considered a "sweet spot" for residential use, providing excellent filtration against pet dander, pollen, and dust mites without severely restricting airflow in most properly sized, healthy systems.
Choose a filter based on your health needs and your system's capabilities. For most homes, a pleated MERV 8 to 11 filter offers the best balance of indoor air quality and airflow. Always check your HVAC manual to ensure you don’t restrict airflow by using a filter that is too dense.
Yes, air purifiers significantly reduce airborne dust by continuously capturing floating particles before they can settle on your furniture and floors. However, they cannot remove dust that has already settled. For best results, use them alongside regular cleaning routines.
Myth #3: More expensive air filters aren't worth the money
In a word, yes. Pleated filters, electrostatic filters, and HVAC air filters with a higher MERV rating are all more expensive than the basic 1” fiberglass filter. They also all do a better job of filtering out allergens, pollutants, and contaminants.
HEPA filters last longer than many other types of air filters. Typically, it's best to change your air filters every 90 days. However, the HEPA filter lifespan can reach 6 to 12 months. If longevity is your goal, HEPA filters are often a great choice when compared to other options.
No, standard air purifiers do not physically remove moisture from the air. They merely cycle air through filters (like HEPA and carbon) to trap pollutants. However, the continuous airflow from the device's fan can increase evaporation from your skin and nasal passages, making the air feel drier.
100 Microns: Filters with a 100-micron rating are considered coarse filters and are typically used to remove larger particles, such as sediment, sand, and rust. These filters are commonly employed in pre-filtration stages to protect finer filters downstream.
A 5 micron rating works well in many industries, including the food and beverage industry. This rating filters a little less than the 5 micron rating. Filters with a 10 micron rating can remove some unseen materials from liquid but not bacteria or viruses.
A 5-micron filter is technically "better" at removing smaller particles than a 25-micron filter, as it catches finer debris (like silt, fine sand, and certain cysts). However, it is a trade-off: the 5-micron filter will clog faster and reduce your flow rate more quickly.