What MERV rating should I use?

MERV 8-11 is ideal for most homes. MERV 13+ is great for allergies but verify your system can handle the restriction.

How often should I change it?

1-inch filters every 30-60 days, 4-inch filters every 6-12 months.

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HVAC & Ventilation

Filters & Air Quality

Budget: $2-$5 each (fiberglass MERV 1-4) | Mid-range: $8-$15 each (pleated MERV 8-11) | Premium: $15-$35 each (MERV 13+ or 4-inch deep pleated)

HVAC Air Filters: Furnace & AC Filter Guide by MERV Rating (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 25, 2026|Sources & methodology

HVAC filters capture dust, pollen, and airborne particles to protect your equipment and improve indoor air quality. They are rated by MERV (Minimum Efficiency Reporting Value) from 1-16 for residential use. Higher MERV ratings catch smaller particles but may restrict airflow in systems not designed for them.

Key Features

MERV ratings from 1-16 for residential; Standard sizes fit most HVAC systems; Fiberglass
pleated
and electrostatic types; Replace every 1-3 months; Improves indoor air quality significantly

Specifications

Common sizes: 16x20x1

16x25x1

20x20x1

20x25x1

20x25x4 | MERV: 1-16 | Types: fiberglass

pleated

electrostatic | Depth: 1"

5" | Change interval: 30-90 days

Applications

Central HVAC air filtration; Furnace protection from dust buildup; Allergy and asthma relief; Indoor air quality improvement; Return air grille filter applications

Installation Overview

Turn off HVAC system. Locate filter slot at return air duct or furnace. Slide out old filter noting airflow direction arrow. Insert new filter with arrow pointing toward furnace/blower. Turn system back on.

Pros & Cons

Pros

✓ Essential for HVAC system protection; Improves indoor air quality; Easy to replace; Wide range of filtration levels

Cons

✗ High MERV filters can restrict airflow; Must be changed regularly; Sizes are not always standardized; Premium filters are costly over time

Top Brands

Filtrete (3M)

Honeywell

Nordic Pure

Code Requirements

HVAC systems must have a filter installed per manufacturer specifications. Filter MERV rating should not exceed system design capacity to avoid airflow restriction.

Buying Tips

Buy filters in multi-packs to save money and ensure you always have replacements; Measure your filter slot precisely as sizes vary by brand; MERV 8-11 offers the best balance of filtration and airflow for most homes