20 × 24 Filters | McMaster-Carr

The pleats create a large surface area for filtering without reducing airflow. These filters are typically used as replacement filters in HVAC equipment. The cardboard frame is treated to resist humidity, and the galvanized steel grill prevents sagging.

These filters meet UL 900 flame retardance requirements. Actual size is up to 5/8” less than trade size.

Don’t see the size you need? Additional sizes are available.

1" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	8	44%	73%	3	Polyester Plastic/Polyethylene Plastic Blend	Cardboard	180°	00000000	000000
Pkg. of 12
20 × 24	8	44%	73%	3	Polyester Plastic/Polyethylene Plastic Blend	Cardboard	180°	00000000	00000

2" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	8	44%	73%	3	Polyester Plastic/Polyethylene Plastic Blend	Cardboard	180°	00000000	000000
Pkg. of 12
20 × 24	8	44%	73%	3	Polyester Plastic/Polyethylene Plastic Blend	Cardboard	180°	00000000	00000

4" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	8	44%	73%	3	Polyester Plastic/Polyethylene Plastic Blend	Cardboard	180°	00000000	000000
Pkg. of 6
20 × 24	8	44%	73%	3	Polyester Plastic/Polyethylene Plastic Blend	Cardboard	180°	00000000	00000

Mildew-Resistant Pleated Panel Air Filters

A compound inhibits mildew and mold growth. All of these filters have pleats that create a large surface area for filtering without reducing airflow. They meet UL 900 flame retardance requirements. Actual size is up to 5/8” less than trade size.

Product registration requirements restrict sales to the listed areas.

2" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	1 Micron	3 Microns	Removes Particle Size Down To, microns	Frame Material	Max. Temperature, °F	Cannot Be Sold To		Pkg.
Pkg. of 1
Synthetic Fiber
20 × 24	8	20%	70%	3	Cardboard	150°	Canada	00000000	000000
Pkg. of 12
Synthetic Fiber
20 × 24	8	20%	70%	3	Cardboard	150°	Canada	00000000	000000

Panel Air Filters

These filters are typically used as replacements in HVAC equipment.

All meet UL Classified flame retardance requirements. Actual size is up to 5/8” more or less than trade size.

Prefilters can be used as a standalone filter or a prefilter that guards your main filter. They’re an economical choice for protecting expensive filters that catch fine particles.

Prefilters
HVAC Filter Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F	Pkg. Qty.		Pkg.
1" Thick
20 × 24	5	20%	3	Fiberglass	Cardboard	180°	12	00000000	000000
2" Thick
20 × 24	5	20%	3	Fiberglass	Cardboard	180°	12	0000000	00000

Heavy Duty Reusable Metal Panel Filters

With a frame made of a thick gauge metal, these filters are durable. They can be washed and reused. Also known as metal mesh filters.

All meet UL 900 flame retardance requirements.

Don’t see the size you need? Additional sizes are available.

1" Thick
HVAC Filter Trade Size	MERV Filter Rating	Removes Particle Size Down To, microns	Material	Frame Gauge	Max. Temperature, °F		Each
20 × 24	4	10	Aluminum	18	240°	0000000	000000
2" Thick
20 × 24	4	10	Aluminum	18	240°	0000000	00000

Reusable Metal Panel Filters

Also known as metal mesh filters. These filters can be washed and reused.

These filters meet UL 900 flame retardance requirements. Actual size is up to 1/2" less than trade size.

2" Thick
HVAC Filter Trade Size	Material	Frame Gauge	Max. Temperature, °F	Filter Style		Each
20 × 24	Aluminum	24	240°	Panel	0000000	000000

Quick-Disconnect Reusable Metal Panel Filters

Magnetic strips on the back of the frame make these filters easy to install and remove. Because you don’t need to disassemble equipment to remove them, they are often used as prefilters on steel air intake louvers, metal cabinets, and metal grid systems. These filters can be washed and reused. They are made of polypropylene, so an electrostatic charge attracts dust and particles to them.

3/8" Thick
HVAC Filter Trade Size	Material	Frame Material	Frame Gauge	Max. Temperature, °F	Filter Style		Each
20 × 24	Polypropylene Plastic	Stainless Steel	26	180°	Panel	0000000	0000000

Reusable Electrostatic Panel Air Filters

An inherent electrostatic charge attracts dust and particles to these filters. They can be washed and reused.

These filters meet UL 900 flame retardance requirements. Actual size is up to 1/2" less than trade size.

1" Thick
HVAC Filter Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temperature, °F		Each
20 × 24	6	35%	3	Polypropylene Plastic/Polyester Plastic Blend	Galvanized Steel	180°	0000000	000000

Ultra-Efficiency Panel Air Filters

Rated MERV 13, these filters capture particles down to 0.3 microns. Use in data centers, hospitals, and other locations that require extra-clean air. These filters have pleats that create a large surface area for filtering without reducing airflow. The cardboard frame is treated to resist humidity, and the galvanized steel grill prevents sagging.

Filters meet UL 900 flame retardance requirements. Actual size is up to 5/8" less than trade size.

1" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 12
20 × 24	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000

2" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 12
20 × 24	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000

4" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 6
20 × 24	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000

High-Efficiency Panel Air Filters

Rated MERV 11, these filters capture particles down to 1 micron. Use in data centers and other locations that require extra-clean air. These filters have pleats that create a large surface area for filtering without reducing airflow. The cardboard frame is treated to resist humidity, and the galvanized steel grill prevents sagging.

These filters meet UL 900 flame retardance requirements. Actual size is up to 5/8" less than trade size.

1" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temperature, °F		Pkg.
Pkg. of 2
20 × 24	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000
Pkg. of 12
20 × 24	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	000000	000000

2" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000
Pkg. of 12
20 × 24	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000

4" Thick

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Pkg.
Pkg. of 2
20 × 24	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000
Pkg. of 6
20 × 24	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000

High-Efficiency Long-Life Panel Air Filters

With tight pleats, these filters have a larger surface area than filters with standard pleats for improved efficiency and an even longer life. These filters strike a good balance of filtering efficiently while allowing airflow, making them a more cost-effective option than higher rated filters. All are effective at capturing common allergens such as dander, mold spores, and pollen. Use them in data centers and other locations that require extra-clean air.

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temperature, °F		Each
2" Thick
20 × 24	11	20%	65%	85%	1	Fiberglass	Plastic	175°	0000000	000000
4" Thick
20 × 24	11	20%	65%	85%	1	Fiberglass	Plastic	175°	0000000	00000

Odor-Removal Panel Air Filters

Carbon granules in these filters remove odors. They are pleated to maximize filtering surface area without reducing airflow. The cardboard frame is treated to resist humidity.

Actual size is up to 5/8" less than trade size.

1" Thick
HVAC Filter Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Carbon Concentration, g/sq. ft.	Material	Frame Material	Max. Temperature, °F		Each
20 × 24	7	50%	3	20	Carbon-Filled Polyester Plastic	Cardboard	140°	00000000	000000
2" Thick
20 × 24	7	50%	3	20	Carbon-Filled Polyester Plastic	Cardboard	140°	00000000	00000
4" Thick
20 × 24	7	50%	3	20	Carbon-Filled Polyester Plastic	Cardboard	140°	00000000	00000

Strong-Odor-Removal Panel Air Filters

Eliminate heavy odors with these filters that have 30 times the odor removing ability of standard odor-removal air filters. The cardboard frame is treated to resist humidity, and the galvanized steel grill prevents sagging.

These filters meet UL 900 flame retardance requirements. Actual size is up to 5/8" less than trade size.

2" Thick
HVAC Filter Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Carbon Concentration, g/sq. ft.	Material	Frame Material	Max. Temperature, °F		Each
20 × 24	7	50%	3	300	Carbon-Filled Polyester Plastic	Cardboard	120°	0000000	000000

Ultra-Efficiency Odor-Removal Panel Air Filters

Clear the air of fine particles and odors caused by high levels of pollution, such as wildfire smoke. Rated MERV 13, these filters capture smaller contaminants, such as germs and allergens, more efficiently than filters rated MERV 5 or 7. They contain carbon granules, which absorb odors. All meet UL 900 standards for flame retardance.

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Carbon Concentration, g/sq. ft.	Material	Frame Material	Max. Temperature, °F		Each
2" Thickness
20 × 24	13	45%	85%	95%	0.3	18	Carbon-Filled Polyester Plastic	Cardboard	180°	0000000	0000000

Frames for Panel Air Filters

Hold panel filters in place. The frames can be welded together to hold multiple filters. The trade size is the actual size of the frame.

Add clips to attach frames to 1" or 4" filters.

Frames

Frame

Replacement Retaining Clip

Frames								Replacement Retaining Clips
For HVAC Filter Trade Size	For Filter Thick.	Frame Material	Frame Gauge	Mounting Hardware Included	Includes		Each	Pkg. Qty.		Pkg.
20 × 24	2"	Galvanized Steel	16	Yes	Retaining Clips, Sealing Gasket	00000000	000000	2	00000000	00000

Optional Clips

Optional Clip

For Filter Thickness	Material	Pkg. Qty.		Pkg.
1"	Galvanized Steel	2	00000000	00000
4"	Galvanized Steel	2	00000000	0000

Long-Life Box Air Filters

Four Panels

Eight Panels

Multiple panels maximize filtering surface area for long service life. These MERV 14 air filters capture particles down to 0.3 microns. They have a V-shape design and a rigid frame that withstands fluctuations in airflow, such as those created by variable air volume systems. The more filter panels they have, the more filtering surface they have for a longer service life.

Actual size is up to 5/8" less than trade size.

		Filter Efficiency @
HVAC Filter Trade Size	MERV Filter Rating	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temp., °F		Each
4 Panels
12" Thick
20 × 24	14	75%	90%	95%	0.3	Fiberglass	Plastic	180°	0000000	0000000
8 Panels
12" Thick
20 × 24	14	75%	90%	95%	0.3	Fiberglass	Plastic	180°	0000000	000000

Box Air Filters

The rigid frame on these filters withstands fluctuations in airflow, such as those created by variable air volume systems.

MERV 11 filters capture common allergens, such as dander, mold spore, and pollen, so they are often used in data centers and other locations that require extra-clean air. They strike a good balance between filtration efficiency and airflow.

MERV 14 filters provide a higher level of filtration than MERV 11 filters and are more effective at capturing finer allergens and viruses for an enhanced level of protection. These filters are often used in environments to protect against airborne contaminants from wildfire smoke and in regions with high pollution levels.

Filters meet UL 900 flame retardance requirements. Actual size is up to 5/8" less than trade size.

	Filter Efficiency @
HVAC Filter Trade Size	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Frame Material	Max. Temperature, °F		Each
MERV 11
6" Thick Fiberglass
20 × 24	20%	65%	85%	1	Galvanized Steel	180°	0000000	0000000
12" Thick Fiberglass
20 × 24	20%	65%	85%	1	Galvanized Steel	180°	0000000	000000
MERV 14
6" Thick Fiberglass
20 × 24	75%	90%	95%	0.3	Galvanized Steel	180°	0000000	000000
12" Thick Fiberglass
20 × 24	75%	90%	95%	0.3	Galvanized Steel	180°	0000000	000000

Bag Air Filters

The deep pockets on these filters maximize filtering surface area with minimal airflow resistance. Actual size is 5/8” less than trade size.

		Filter Efficiency @
HVAC Filter Trade Size	Dp.	0.3 Microns	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temperature, °F		Each
MERV 10
20 × 24	15"	__	50%	80%	1	Polypropylene Plastic	Galvanized Steel	175°	000000000	000000
20 × 24	22"	__	50%	80%	1	Polypropylene Plastic	Galvanized Steel	175°	00000000	00000
20 × 24	30"	__	50%	80%	1	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
MERV 12
20 × 24	15"	35%	80%	90%	1	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
20 × 24	22"	35%	80%	90%	1	Polypropylene Plastic	Galvanized Steel	175°	00000000	00000
20 × 24	30"	35%	80%	90%	1	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
MERV 14
20 × 24	15"	75%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
20 × 24	22"	75%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
MERV 15
20 × 24	15"	85%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
20 × 24	22"	85%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	00000000	00000
20 × 24	30"	85%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000

Cube Air Filters

Prevent air from bypassing your filter. These filters are self-sealing thanks to the filter material that fully encloses the metal frame. This design also means you don't need separate mounting hardware. They last longer than standard pleated filters. All meet UL standards for flame retardance.

	Filter Efficiency @
HVAC Filter Trade Size	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temperature, °F	Specifications Met		Each
MERV 8
10" Deep
20 × 24	10%	50%	3	Polyester Plastic/Polyethylene Plastic Blend	Steel	180°	UL 900	0000000	000000
15" Deep
20 × 24	10%	50%	3	Polyester Plastic/Polyethylene Plastic Blend	Steel	180°	UL 900	0000000	00000
20" Deep
20 × 24	10%	50%	3	Polyester Plastic/Polyethylene Plastic Blend	Steel	180°	UL 900	0000000	00000