Honeywell Air Purifier Filter Types & Compatibility Guide

One of the most common questions Honeywell air purifier owners have is, "Which replacement filter does my air purifier use?" Honeywell simplifies filter selection by assigning each replacement filter a letter designation, such as Filter A or Filter R. Understanding these letter codes makes it much easier to purchase the correct replacement filters and keep your air purifier operating at peak performance.

This comprehensive Honeywell air purifier filter compatibility chart explains every major filter type, what each filter does, which air purifier models commonly use it, and why choosing Genuine Honeywell Certified Filters helps maintain proper airflow, filtration efficiency, and Clean Air Delivery Rate (CADR).

Honeywell Air Purifier Filter Compatibility Chart

Filter	Part Number	Filter Type	Replacement Time	Common Compatible Models
A	HRF-AP1 / APP1	Universal Carbon Pre-Filter	Every 3 months	HPA100-300 / HPA020-080 / HPA3000-5000 Series
B	HRFB2	Odor & Gas Pre-Filter	Every 3 months	HHT055-149 / HPA050-245 / 16200 Series
C	HRFC1	HEPA-Type Filter	Every 4–6 months	HHT080-85 / HHT090 / HHT145-149 / 16200 Series
F	HRFF1	HEPA Round Filter	Every 1–5 years	17200 / 13520 / 18150 / 50150-50300 Series
G	HRFG1	True HEPA Filter	Up to 12 months	HPA020-030 / HPA075-080 / HPA175-180 Series
H	HRFH1	True HEPA Filter	Up to 12 months	HPA050 / HPA150 / HPA060 / HPA160 / HPA055-155 Series
K	HRFK2	Premium Carbon Pre-Filter	Every 3 months	HFD120 - HFD360 Series
O	HRFO1	HEPA Round Filter	Up to 12 months	HPA120 Series
R	HRF-R1 / R2 / R3	True HEPA Filter	Up to 12 months	HPA090-300 / HPA3100-5350 / HPA8350 Series
S	HRFSS1 / HRFSP1	Specialty Smoke & Pet Filter	Varies	HPA3100, HPA3200-5350 Series
T	HRFTS1 / HRFTP1	Specialty Smoke & Odor Filter	Varies	HPA075B-175B / HPA080B / HPA180B Series
U	HRF201B	Dual HEPA Filter	Every 4–6 months	HHT270, HHT290 Series

Pre-Filters & Odor Reduction Layers

Pre-filters capture larger airborne particles before they reach the primary filter. They also help reduce common household odors, extending the life of the main filtration system.

Honeywell Carbon & Pre-Filter Guide

Filter A (HRF-AP1 / HRF-APP1)

The most widely used Honeywell carbon pre-filter. Filter A helps reduce household odors, smoke, cooking smells, and volatile organic compounds (VOCs) while capturing larger airborne particles before they reach the True HEPA filters. It is commonly used in the HPA090, HPA100, HPA200, and HPA300 Series.

Replacement Interval: Approximately every 3 months.

Filter B (HRFB2)

Filter B is an enhanced carbon pre-filter designed to provide additional odor and gas reduction in compatible Honeywell air purifiers. It's an excellent choice for homes with pets, cooking odors, or smoke concerns.

Replacement Interval: Approximately every 3 months.

Filter C (HRFC1)

Filter C is a HEPA-Type replacement filter commonly found in compact tabletop and tower air purifiers, including select 16200 and HHT090 models. It provides effective filtration for everyday household particles.

Filter K (HRFK2)

Designed for select compact tabletop air purifiers, Filter K combines premium activated carbon with excellent airflow characteristics to help reduce odors while protecting the primary filtration stage.

True HEPA Replacement Filters

Honeywell True HEPA filters are engineered to capture up to 99.97% of airborne particles as small as 0.3 microns, including dust, pollen, pet dander, mold spores, and other common allergens.

True HEPA Filter Guide

Filter G (HRFG1)

Designed for select compact tower air purifiers requiring certified True HEPA filtration.

Filter H (HRFH1)

Designed specifically for Honeywell HPA050 and HPA150 Series air purifiers, Filter H delivers certified True HEPA filtration for smaller rooms.

Filter J (HRFJ1)

A specialized True HEPA drum filter used in select Honeywell air purifier models requiring cylindrical filter assemblies.

Filter O (HRFO1)

A legacy replacement True HEPA filter designed for certain earlier Honeywell tower air purifier models.

Filter R (HRF-R1 / HRF-R2 / HRF-R3)

Filter R is Honeywell's flagship True HEPA replacement filter. It is compatible with many of Honeywell's most popular air purifiers, including the HPA090, HPA100, HPA200, and HPA300 Series. Depending on the purifier model, one, two, or three Filter R cartridges may be required.

Filter R captures up to 99.97% of microscopic airborne particles and is typically replaced once every 12 months.

Specialty & Dual-Action Filters

Specialized Filter Options

Filter F (HRFF1)

A dual-action HEPA-Type filter designed for compact Honeywell air purifiers where space-saving filtration is required.

Filter S (HRFSS1)

Filter S is a specialty performance filter engineered for applications such as enhanced smoke reduction, pet households, or allergen-sensitive environments on compatible models.

Filter T (HRFT1)

A specialized performance replacement module designed for select Honeywell air purifier product lines.

Filter U (HRF201B)

Designed for Honeywell HHT270 and HHT290 tabletop air purifiers, Filter U provides dependable HEPA-Type filtration for bedrooms, offices, and smaller living spaces.

Why Choose Genuine Honeywell Certified Filters?

Genuine vs. Third-Party Replacement Filters

While many third-party replacement filters advertise compatibility, Genuine Honeywell Certified Filters are engineered specifically for Honeywell air purifiers and are tested to meet the airflow and filtration requirements of each model.

Designed for proper fit and sealing.
Maintain intended airflow and CADR performance.
Provide filtration performance consistent with Honeywell product specifications.
Help prevent air bypass caused by poorly fitting filters.
Manufactured specifically for compatible Honeywell air purifier models.

Using genuine replacement filters helps ensure your air purifier continues operating as designed throughout its service life.

How to Find Your Air Purifier's Filter Type

If you're unsure which replacement filter your Honeywell air purifier requires, locate the model number on the rating label, typically found on the back or bottom of the unit. Once you have the model number, compare it with your owner's manual, product documentation, or the filter compatibility information on the Honeywell Store to identify the correct replacement filter.

Frequently Asked Questions

Why does my HPA300 require three Filter R cartridges?

The Honeywell HPA300 is designed with a multi-filter filtration system to increase airflow and filtration capacity. Three Filter R cartridges work together to provide greater surface area and improved particle capture for larger rooms.

Can I stack a Filter S onto a standard HEPA block?

Only use filter combinations specifically recommended for your Honeywell air purifier model. Installing filters that are not designed to work together may reduce airflow and affect overall filtration performance.

How do I find my air purifier's model number?

The model number is usually printed on a label located on the back, bottom, or underside of the air purifier. Once identified, you can use it to determine the correct replacement filter letter and compatible part numbers.

Can I use a different filter letter if it looks the same?

No. Each Honeywell filter letter is designed for specific air purifier models and filtration systems. Even if two filters appear similar, using the wrong replacement filter can affect fit, airflow, and cleaning performance.

How often should I replace my Honeywell air purifier filters?

Replacement intervals vary by filter type. Carbon pre-filters are typically replaced every three months, while most True HEPA filters last up to twelve months under normal household conditions. Always follow the recommendations for your specific air purifier model.