2" AC Filters and Furnace Filters

This is normal. Most “2-inch” filters are nominal size, meaning the labeled depth is rounded. Actual depth is typically 1.75" to 1.8" so the filter slides into the HVAC slot without binding. Always match the nominal size printed on your current filter.

A 2-inch filter generally offers: More surface area
Better airflow stability
Longer lifespan
Less frequent replacements
But only use a 2-inch filter if your HVAC system is designed for it. Forcing a deeper filter into a 1-inch slot can cause airflow problems or damage the system.

Most 2" pleated filters last 60–90 days, depending on dust, pets, occupancy, and system usage. Fiberglass 2-inch filters should be checked monthly.

Most systems handle MERV 8–11 safely at the 2" depth. Higher MERV ratings may restrict airflow unless the HVAC system is rated for them.

Many homes use 1-inch or 4-inch filters. Two-inch filters are more common in: Older units
Commercial or light commercial systems
Multifamily buildings
Certain packaged HVAC units
We stock all standard 2" sizes and can build custom dimensions.

Only if your HVAC system is designed for it. Never substitute thickness unless the unit’s documentation confirms compatibility.

For most residential air conditioners, MERV 8 is the perfect balance. It provides great filtration without overworking the system. If you have significant allergies, a MERV 11 filter is a good option, but check your system's manual before going higher.

While the brand of your HVAC unit is important, the filter brand is less so. What truly matters is that the filter is the correct size, has the right MERV rating, and is made from quality materials. As an authorized dealer for top brands, we guarantee all three.