Reticulated Foam | McMaster-Carr

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About Air Filter Efficiency Ratings

Compare MERV rating, efficiency, and particle size to find the right filter for your location—from warehouses and offices to hospitals and labs.

Form

Roll

Cut multiple filters from a single roll

38 products

Pad

Cut pads to the size you need

52 products

Air Filter Performance

Low Efficiency

Extend the life of expensive filters that catch fine particles

80 products

For Use With

Electronics

Stand up to prolonged exposure to heat and humidity

10 products

Low-Efficiency Reusable Air Filter Media

Wash and reuse this media to extend the life of expensive filters that catch fine particles. Installed upstream, this affordable media traps debris that can damage or clog your final filter. Cut it to the size you need and attach it to a frame.

Polyurethane Foam Rolls

Image of Product. Front orientation. Air Filter Media. Low-Efficiency Reusable Air Filter Media, Rolls.

Pores per Inch—Media containing more pores per inch catch smaller particles than media with fewer pores per inch.

	MERV Filter Rating	Max. Temp., ° F	Specs. Met	Choose a Number of Pores per Inch		5 ft. Long	10 ft. Long	25 ft. Long
1/8" Thick



	8"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	000000


	12"	Not Rated	200	UL 900	30 , 60	00000000	0000	00000	00000
	24"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000
	36"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000
	48"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000


	1/4" Thick



			8"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000


			12"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000
			24"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000
			36"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	000000
			48"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	000000


			1/2" Thick



					8"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000


					12"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	00000
					24"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	000000
					36"	Not Rated	200	UL 900	30 , 60	00000000	00000	000000	000000
					48"	Not Rated	200	UL 900	30 , 60	00000000	00000	000000	000000


					1" Thick



							8"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	000000


							12"	Not Rated	200	UL 900	30 , 60	00000000	00000	00000	000000
							24"	Not Rated	200	UL 900	30 , 60	00000000	00000	000000	000000
							36"	Not Rated	200	UL 900	30 , 60	00000000	000000	000000	000000
							48"	Not Rated	200	UL 900	30 , 60	00000000	000000	000000	000000

Polyurethane Foam Pads

Image of Product. Front orientation. Air Filter Media. Low-Efficiency Reusable Air Filter Media, Pads.

Pores per Inch—Media containing more pores per inch catch smaller particles than media with fewer pores per inch.

	MERV Filter Rating	Max. Temp., ° F	Specs. Met	Choose a Number of Pores per Inch		Each
1/8" Thick



	12 × 12	Not Rated	250	UL 900	30 , 60	00000000	00000


	12 × 24	Not Rated	250	UL 900	30 , 60	00000000	0000
	16 × 20	Not Rated	250	UL 900	30 , 60	00000000	0000
	16 × 25	Not Rated	250	UL 900	30 , 60	00000000	0000
	20 × 20	Not Rated	250	UL 900	30 , 60	00000000	0000
	20 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
	24 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
	48 × 72	Not Rated	250	UL 900	20 , 45 , 65 , 80 , 100	000000	00000


	1/4" Thick



			12 × 12	Not Rated	250	UL 900	30 , 60	00000000	0000


			12 × 24	Not Rated	250	UL 900	30 , 60	00000000	0000
			16 × 20	Not Rated	250	UL 900	30 , 60	00000000	0000
			16 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
			20 × 20	Not Rated	250	UL 900	30 , 60	00000000	00000
			20 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
			24 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
			48 × 72	Not Rated	250	UL 900	20 , 45 , 65 , 80 , 100	000000	00000


			1/2" Thick



					12 × 12	Not Rated	250	UL 900	30 , 60	00000000	0000


					12 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
					16 × 20	Not Rated	250	UL 900	30 , 60	00000000	00000
					16 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
					20 × 20	Not Rated	250	UL 900	30 , 60	00000000	00000
					20 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
					24 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
					48 × 72	Not Rated	250	UL 900	20 , 45 , 65 , 80 , 100	000000	000000


					1" Thick



							12 × 12	Not Rated	250	UL 900	30 , 60	00000000	00000


							12 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
							16 × 20	Not Rated	250	UL 900	30 , 60	00000000	00000
							16 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
							20 × 20	Not Rated	250	UL 900	30 , 60	00000000	00000
							20 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
							24 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
							48 × 72	Not Rated	250	UL 900	20 , 45 , 65 , 80 , 100	000000	000000


							2" Thick



							12 × 12	Not Rated	250	UL 900	30 , 60	00000000	00000


							12 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
							16 × 20	Not Rated	250	UL 900	30 , 60	00000000	00000
							16 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
							20 × 20	Not Rated	250	UL 900	30 , 60	00000000	00000
							20 × 25	Not Rated	250	UL 900	30 , 60	00000000	00000
							24 × 24	Not Rated	250	UL 900	30 , 60	00000000	00000
							48 × 72	Not Rated	250	UL 900	20 , 45 , 65 , 80 , 100	000000	000000

Low-Efficiency Reusable Air Filter Media Selector Packs

Determine the right pores per inch for your air filtering application. Each sample piece has a different pore size.

Pores per Inch—Media containing more pores per inch catch smaller particles than media with fewer pores per inch.

Pores per In.	Wd.	Lg.	Thk.	MERV Filter Rating	Specs. Met	No. of Pieces		Each
20, 45, 65, 80, 100	6"	6"	1/8"	Not Rated	UL 900	5	0000000	000000
30, 60	3"	3"	1/4"	Not Rated	UL 900	2	0000000	0000

Reusable Air Filter Media for Electronics

Wash and reuse this media to keep the air in your electronics clean. It won't break down when exposed to prolonged heat and humidity. Cut it to the size you need.

HVAC Filter Trade Size	MERV Filter Rating	Specs. Met	1/4" Thick	1" Thick
8 × 8	Not Rated	UL 900	00000	00000
10 × 10	Not Rated	UL 900	0000	00000
10 × 20	Not Rated	UL 900	00000	00000
14 × 14	Not Rated	UL 900	00000	00000
16 × 20	Not Rated	UL 900	00000	00000
16 × 25	Not Rated	UL 900	00000	00000
20 × 20	Not Rated	UL 900	00000	00000
20 × 25	Not Rated	UL 900	00000	000000
20 × 30	Not Rated	UL 900	00000	000000
24 × 24	Not Rated	UL 900	00000	00000

Reinforced Reusable Air Filter Media

Wrapped in aluminum mesh for added support, this filter media can be used without a frame. Just cut it to the size you need. When it gets dirty, wash and reuse it.

					5 ft. Long		10 ft. Long		25 ft. Long
	Wd.	MERV Filter Rating	Max. Temp., ° F	Specs. Met		Each		Each		Each
1/2" Thick



		15 1/8"	4	250	UL 900	0000000	000000	0000000	000000	000000	0000000


		19 1/8"	4	250	UL 900	0000000	00000	0000000	00000	000000	000000
		24 1/8"	4	250	UL 900	0000000	00000	0000000	000000	000000	000000


		1" Thick



				15 1/8"	4	250	UL 900	0000000	00000	0000000	00000	000000	000000


				19 1/8"	4	250	UL 900	0000000	00000	0000000	000000	000000	000000
				24 1/8"	4	250	UL 900	0000000	00000	0000000	000000	000000	000000