20 × 20 Filters | McMaster-Carr

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	Filter Efficiency @ 0.3 Microns Filter Efficiency @ 0.3 Microns

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About Air Filter Efficiency Ratings

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.

For technical drawings and 3-D models, click on a part number.

1" Thick

		Filter Efficiency @
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 × 20	9	35%	75%	3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 12
20 × 20	9	35%	75%	3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	00000

2" Thick

		Filter Efficiency @
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 × 20	9	35%	75%	3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 12
20 × 20	9	35%	75%	3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	00000

4" Thick

		Filter Efficiency @
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 × 20	9	35%	75%	3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 6
20 × 20	9	35%	75%	3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	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.

For technical drawings and 3-D models, click on a part number.

1" Thick

						Pkg. of 2		Pkg. of 12
Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Frame Material	Max. Temperature, °F		Pkg.		Pkg.
Synthetic Fiber
20 × 20	7	90%	3	Cardboard	150°	00000000	000000	00000000	0000000

2" Thick

						Pkg. of 2		Pkg. of 12
Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Frame Material	Max. Temperature, °F		Pkg.		Pkg.
Synthetic Fiber
20 × 20	7	90%	3	Cardboard	150°	00000000	000000	00000000	0000000

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” 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.

For technical drawings and 3-D models, click on a part number.

Prefilters
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 × 20	5	20%	3	Fiberglass	Cardboard	180°	12	00000000	000000
2" Thick
20 × 20	5	20%	3	Fiberglass	Cardboard	180°	12	0000000	00000

Snug-Fit Panel Air Filters

The filter material extends beyond the frame for a tight fit, creating a seal to prevent air from bypassing the filter around its edges. A tacky surface on the filter retains particles.

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

		Filter Efficiency @
Trade Size	MERV Filter Rating	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Max. Temperature, °F		Pkg.
Pkg. of 2
1" Thick
20 × 20	8	20%	70%	3	Polyester Plastic	220°	0000000	000000
Pkg. of 12
1" Thick
20 × 20	8	20%	70%	3	Polyester Plastic	220°	0000000	000000

Mildew-Resistant Snug-Fit Panel Air Filters

A compound inhibits mildew, mold, and fungi growth on these filters. The filter material extends beyond the frame for a tight fit, creating a seal to prevent air from bypassing the filter around its edges. A tacky surface on the filter retains particles.

These filters meet UL 900 flame retardance requirements. Actual size is 3/4" greater than trade size.

		Filter Efficiency @
Trade Size	MERV Filter Rating	1 Micron	3 Microns	Removes Particle Size Down To, microns	Material	Max. Temperature, °F		Each
1 1/2" Thick
20 × 20	8	20%	70%	3	Polyester Plastic	200°	0000000	000000

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. Actual size is up to 1/2" less than trade size.

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

For technical drawings and 3-D models, click on a part number.

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

For technical drawings and 3-D models, click on a part number.

1" Thick
Trade Size	Material	Frame Gauge	Max. Temperature, °F		Each
20 × 20	Aluminum	24	240°	0000000	000000
2" Thick
20 × 20	Aluminum	24	240°	0000000	00000

High-Temperature Reusable Metal Panel Filters

Galvanized Steel

Stainless Steel

These filters are built to withstand higher temperatures than other metal panel air filters. They can be washed and reused.

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

2" Thick
Trade Size	MERV Filter Rating	Removes Particle Size Down To, microns	Max. Temperature, °F	Features	For Removing		Each
Galvanized Steel
20 × 20	4	10	425°	__	Dust and Particles	0000000	000000
Stainless Steel
20 × 20	4	10	900°	Handles	Dust and Particles, Grease	00000000	000000

Optional Handles for Galvanized Steel Units

0000000

Pair

00000

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.

For technical drawings and 3-D models, click on a part number.

1" Thick
Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Material	Frame Material	Max. Temperature, °F		Each
20 × 20	6	35%	3	Polypropylene Plastic/Polyester Plastic Blend	Galvanized Steel	180°	0000000	000000
2" Thick
20 × 20	6	35%	3	Polypropylene Plastic/Polyester Plastic Blend	Galvanized Steel	180°	0000000	00000

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.

For technical drawings and 3-D models, click on a part number.

1" Thick

		Filter Efficiency @
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 × 20	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000
Pkg. of 12
20 × 20	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	000000	00000

2" Thick

		Filter Efficiency @
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 × 20	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000
Pkg. of 12
20 × 20	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000

4" Thick

		Filter Efficiency @
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 × 20	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	000000
Pkg. of 6
20 × 20	11	20%	65%	85%	1	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	0000000	00000

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.

For technical drawings and 3-D models, click on a part number.

1" Thick

		Filter Efficiency @
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 × 20	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 12
20 × 20	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000

2" Thick

		Filter Efficiency @
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 × 20	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 12
20 × 20	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000

4" Thick

		Filter Efficiency @
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 × 20	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000
Pkg. of 6
20 × 20	13	50%	85%	90%	0.3	Polyethylene Plastic/Polypropylene Plastic Blend	Cardboard	150°	00000000	000000

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, and the galvanized steel grill prevents sagging.

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

For technical drawings and 3-D models, click on a part number.

1" Thick
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 × 20	5	20%	3	10	Carbon-Coated Polyester Plastic	Cardboard	225°	00000000	000000
2" Thick
20 × 20	5	20%	3	10	Carbon-Coated Polyester Plastic	Cardboard	225°	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.

For technical drawings and 3-D models, click on a part number.

2" Thick
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 × 20	7	50%	3	300	Carbon-Coated Polyester Plastic	Cardboard	120°	0000000	000000

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.

For technical drawings and 3-D models, click on a part number.

Frames

Frame

Replacement Retaining Clip

Frames								Replacement Retaining Clips
Trade Size	For Filter Thick.	Frame Material	Frame Gauge	Mounting Hardware Included	Includes		Each	Pkg. Qty.		Pkg.
20 × 20	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

Grease Filters

Use in exhaust hoods to remove grease and oil from the air. These filters have layers of baffled metal that collect grease while allowing air to pass through. Install so baffles are vertical.

Actual size is 1/2" less than trade size. Trade size is height × width.

For technical drawings and 3-D models, click on a part number.

2" Thick
Trade Size	Max. Temperature, °F	Specifications Met	Useful Life		Each
Aluminum
20 × 20	250°	NFPA 96, UL Recognized Component	Reusable	0000000	000000
Galvanized Steel
20 × 20	450°	NFPA 96, UL Recognized Component	Reusable	0000000	00000
Stainless Steel
20 × 20	900°	NFPA 96, UL Recognized Component	Reusable	0000000	000000

Air Filter Pads

Cut these pads to the size you need; frames are sold separately.

All meet UL Classified flame retardance requirements.

Pads with a tacky surface retain particles better than other pads. They are blue on one side and white on the other.

1/2" Thick
Trade Size	Material	Surface Treatment	Color	Max. Temperature, °F	Pkg. Qty.		Pkg.
20 × 20	Polyester Plastic	Tacky	Blue, White	220°	10	0000000	000000
1" Thick
20 × 20	Polyester Plastic	Tacky	Blue, White	220°	10	0000000	00000
2" Thick
20 × 20	Polyester Plastic	__	White	220°	10	0000000	00000

Prefilter Air Filter Pads

These pads are an economical choice for protecting more expensive filters that catch finer particles. Cut to the size you need; frames are sold separately.

Pads meet UL 900 flame retardance requirements.

Pkg. of 6
Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Material	Color	Max. Temperature, °F		Pkg.
1" Thick
20 × 20	6	35%	3	Fiberglass	White	250°	00000000	000000
2" Thick
20 × 20	6	35%	3	Fiberglass	White	250°	00000000	00000
Pkg. of 50
1" Thick
20 × 20	6	35%	3	Fiberglass	White	250°	00000000	000000
2" Thick
20 × 20	6	35%	3	Fiberglass	White	250°	00000000	000000

Mildew-Resistant Reusable Air Filter Pads

Wash and reuse these lightweight filter pads that resist mildew growth. Cut to the size you need; frames are sold separately.

Pads with more pores per inch catch smaller particles than pads with fewer pores per inch.

These pads meet UL 900 flame retardance requirements.

1/8" Thick
Trade Size	Material	Color	Max. Temperature, °F	Pores Per Inch		Each
20 × 20	Polyurethane Foam	Gray	250°	30, 60	00000000	00000
1/4" Thick
20 × 20	Polyurethane Foam	Gray	250°	30, 60	00000000	00000
1/2" Thick
20 × 20	Polyurethane Foam	Gray	250°	30, 60	00000000	00000
1" Thick
20 × 20	Polyurethane Foam	Gray	250°	30, 60	00000000	00000
2" Thick
20 × 20	Polyurethane Foam	Gray	250°	30, 60	00000000	00000

Reusable Air Filter Pads

Wash and reuse these pads. Cut to the size you need. No frame needed—rigid polyester is firm enough to be used without one.

Pads meet UL 900 flame retardance requirements.

1/2" Thick
Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Material	Color	Max. Temp., °F	Pkg. Qty.		Pkg.
20 × 20	5	20%	3	Polyester Plastic	Blue	225°	5	00000000	000000
1" Thick
20 × 20	6	35%	3	Polyester Plastic	Blue	225°	5	00000000	00000
2" Thick
20 × 20	__	__	__	Polyester Plastic	Green	200°	5	00000000	00000

Electronic Equipment Air Filter Pads

Disposable

Reusable

Designed for use with electronic equipment, these pads can withstand prolonged exposure to heat and humidity. Cut to the size you need.

Pads meet UL flame retardance requirements.

Reusable pads can be washed.

Disposable
Trade Size	Material	Pores Per Inch	Specifications Met	For Removing		1/4" Thick	1/2" Thick	1" Thick
20 × 20	Polyester Plastic	__	UL 900	Dust and Particles, Oils and Coolants	00000000	00	00000	00000
Reusable
20 × 20	Polyurethane Foam	45	UL 900	Dust and Particles, Oils and Coolants	00000000	000000	00000	00000

Odor-Removal Air Filter Pads

With a higher carbon concentration than odor-removal air filter rolls, these pads handle heavier odors. Cut to the size you need; frames are sold separately.

All meet UL 900 flame retardance requirements.

Pads with a carbon concentration of 375 g/sq. ft. provide greater odor control than other pads and can handle ammonia, hydrogen sulfide, and other gases. They are often used in hospitals and laboratories.

300 g/sq. ft. Carbon Concentration
Trade Size	MERV Filter Rating	Filter Efficiency @ 3 Microns	Removes Particle Size Down To, microns	Material	Color	Max. Temperature, °F		Each
1" Thick
20 × 20	7	50%	3	Carbon-Coated Polyester Plastic	Black	120°	0000000	000000
375 g/sq. ft. Carbon Concentration
1" Thick
20 × 20	7	50%	3	Carbon-Coated Polyester Plastic	Black	120°	00000000	00000

Frames for Air Filter Rolls and Pads

Add support to filter rolls and pads that have been cut to size. Actual size is 1/2" less than trade size.

For 1/2" Filter Thick.
Trade Size	Frame Material	Frame Gauge	Support Grill Gauge	Includes		Each
20 × 20	Galvanized Steel	24	16	Retaining Wires	0000000	000000
For 7/8" Filter Thick.
20 × 20	Galvanized Steel	24	16	Retaining Wires	0000000	00000
For 1 7/8" Filter Thick.
20 × 20	Galvanized Steel	24	16	Retaining Wires	0000000	00000

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 @
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 × 20	15"	__	50%	80%	1	Polypropylene Plastic	Galvanized Steel	175°	000000000	000000
20 × 20	22"	__	50%	80%	1	Polypropylene Plastic	Galvanized Steel	175°	00000000	00000
MERV 12
20 × 20	15"	35%	80%	90%	1	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
20 × 20	22"	35%	80%	90%	1	Polypropylene Plastic	Galvanized Steel	175°	00000000	00000
MERV 14
20 × 20	15"	75%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
20 × 20	22"	75%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
MERV 15
20 × 20	15"	85%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	000000000	00000
20 × 20	22"	85%	90%	95%	0.3	Polypropylene Plastic	Galvanized Steel	175°	00000000	00000
MERV 16
20 × 20	15"	95%	95%	95%	0.3	Fiberglass	Galvanized Steel	175°	000000000	00000
20 × 20	30"	95%	95%	95%	0.3	Fiberglass	Galvanized Steel	175°	000000000	000000