MERV 4 Filters | McMaster-Carr

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135 Products

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.

Long-Life Reusable Mesh Panel Air Filters

Last longer than standard reusable filters thanks to a thicker frame and additional mesh layers. The frame also stands up to high airflow without warping. When your filter gets dirty, just wash and reuse it.

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

	HVAC Filter Trade Size	MERV Filter Rating	Frame Ga.	Max. Temp., ° F	Specs. Met		Each
1/2" Thick



		4 × 26	4	18	240	UL 900	2150K521	000000


		5 × 14	4	18	240	UL 900	2150K461	00000
		5 × 15	4	18	240	UL 900	2150K151	00000
		6 × 12	4	18	240	UL 900	2150K441	00000
		6 × 18	4	18	240	UL 900	2150K15	00000
		6 × 21	4	18	240	UL 900	2150K181	00000
		6 × 6	4	18	240	UL 900	2150K161	00000
		6 × 9	4	18	240	UL 900	2150K171	00000
		7 × 23 3/8	4	18	240	UL 900	2150K41	00000
		7 × 35	4	18	240	UL 900	2150K421	00000
		8 × 21	4	18	240	UL 900	2150K191	00000


		9 3/8 × 16 1/2	4	18	240	UL 900	2150K43	00000
		9 × 10	4	18	240	UL 900	2150K431	00000
		9 × 21	4	18	240	UL 900	2150K42	00000
		10 × 10	4	18	240	UL 900	2150K211	00000
		10 × 16	4	18	240	UL 900	2150K471	00000
		10 × 20	4	18	240	UL 900	2150K221	00000
		11 × 11	4	18	240	UL 900	2150K231	00000
		12 × 12	4	18	240	UL 900	2150K16	00000
		12 × 22	4	18	240	UL 900	2150K45	00000
		13 × 13	4	18	240	UL 900	2150K141	00000


		13 × 16	4	18	240	UL 900	2150K17	00000
		13 × 17	4	18	240	UL 900	2150K451	00000
		15 × 15	4	18	240	UL 900	2150K241	00000
		16 × 16	4	18	240	UL 900	2150K251	00000
		16 × 23	4	18	240	UL 900	2150K261	00000
		16 × 25	4	18	240	UL 900	2150K481	00000
		16 × 8	4	18	240	UL 900	2150K121	00000
		17 × 20	4	18	240	UL 900	2150K491	00000
		17 × 30	4	18	240	UL 900	2150K531	00000
		18 × 18	4	18	240	UL 900	2150K18	00000


		20 × 25	4	18	240	UL 900	2150K511	00000


		1" Thick



				9 × 55	4	18	240	UL 900	2150K571	00000


				10 × 10	4	18	240	UL 900	2150K21	00000
				10 × 12	4	18	240	UL 900	2150K11	00000
				10 × 16	4	18	240	UL 900	2150K271	00000
				10 × 20	4	18	240	UL 900	2150K22	00000
				12 × 12	4	18	240	UL 900	2150K12	00000
				12 × 14	4	18	240	UL 900	2150K13	00000
				12 × 16	4	18	240	UL 900	2150K14	00000
				12 × 20	4	18	240	UL 900	2150K35	00000
				12 × 24	4	18	240	UL 900	2150K23	00000
				14 × 14	4	18	240	UL 900	2150K36	00000


14 × 20				4	18	240	UL 900	2150K37	00000
14 × 24	4			18	240	UL 900	2150K281	00000
14 × 25	4			18	240	UL 900	2150K24	00000
15 × 20	4			18	240	UL 900	2150K25	00000
15 × 24	4			18	240	UL 900	2150K26	00000
15 × 30	4			18	240	UL 900	2150K27	00000
16 × 16	4			18	240	UL 900	2150K38	00000
16 × 20	4			18	240	UL 900	2150K54	00000
16 × 25	4			18	240	UL 900	2150K55	00000
16 × 30	4			18	240	UL 900	2150K551	00000


18 × 18	4			18	240	UL 900	2150K28	00000
18 × 21	4			18	240	UL 900	2150K591	00000
18 × 24	4			18	240	UL 900	2150K29	00000
18 × 40	4			18	240	UL 900	2150K97	000000
19 × 21	4			18	240	UL 900	2150K291	00000
20 × 20	4			18	240	UL 900	2150K56	00000
20 × 24	4			18	240	UL 900	2150K98	00000
20 × 25	4			18	240	UL 900	2150K57	00000
20 × 30	4			18	240	UL 900	2150K39	00000
22 × 22	4			18	240	UL 900	2150K311	00000


22 × 30	4			18	240	UL 900	2150K31	00000
23 × 25	4			18	240	UL 900	2150K561	00000
24 × 24	4			18	240	UL 900	2150K59	00000
30 × 30	4			18	240	UL 900	2150K32	000000


2" Thick



				10 × 20	4	18	240	UL 900	2150K61	00000


				10 × 24	4	18	240	UL 900	2150K321	00000
				10 × 25	4	18	240	UL 900	2150K331	00000
				12 × 12	4	18	240	UL 900	2150K111	00000
				12 × 23	4	18	240	UL 900	2150K581	00000
				12 × 24	4	18	240	UL 900	2150K131	00000
				14 × 14	4	18	240	UL 900	2150K341	00000
				15 × 20	4	18	240	UL 900	2150K33	00000
				16 × 16	4	18	240	UL 900	2150K351	00000
				16 × 20	4	18	240	UL 900	2150K63	00000
				16 × 24	4	18	240	UL 900	2150K361	00000


		16 × 25	4	18	240	UL 900	2150K64	00000
		16 × 32	4	18	240	UL 900	2150K371	00000
		18 × 18	4	18	240	UL 900	2150K381	00000
		18 × 24	4	18	240	UL 900	2150K391	00000
		18 × 26	4	18	240	UL 900	2150K411	00000
		20 × 20	4	18	240	UL 900	2150K65	00000
		20 × 24	4	18	240	UL 900	2150K88	00000
		20 × 25	4	18	240	UL 900	2150K66	00000
		24 × 24	4	18	240	UL 900	2150K67	00000


		4" Thick



				24 × 24	4	18	240	UL 900	2150K34	000000

High-Temperature Reusable Mesh Panel Air Filters


Galvanized Steel Frame	Stainless Steel Frame

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

	Air Filters						Optional Handles
	HVAC Filter Trade Size	MERV Filter Rating	Max. Temp., ° F	Specs. Met		Each		Pair
Galvanized Steel with Galvanized Steel Frame







				2" Thick

				10 × 10	4	425	UL 900	2157K11	000000	2157K32	00000


				10 × 20	4	425	UL 900	2157K12	00000	2157K32	0000
				12 × 24	4	425	UL 900	2157K13	00000	2157K32	0000
				16 × 20	4	425	UL 900	2157K14	00000	2157K32	0000
				16 × 25	4	425	UL 900	2157K16	00000	2157K32	0000
				20 × 20	4	425	UL 900	2157K18	00000	2157K32	0000
				20 × 25	4	425	UL 900	2157K22	00000	2157K32	0000
				24 × 24	4	425	UL 900	2157K15	00000	2157K32	0000
				30 × 30	4	425	UL 900	2157K17	000000	2157K32	0000


				Stainless Steel with Stainless Steel Frame







								2" Thick

								10 × 10	4	900	UL 900	22115K21	000000	———	0


								10 × 20	4	900	UL 900	22115K22	000000	———	0
								12 × 24	4	900	UL 900	22115K13	000000	———	0
								16 × 20	4	900	UL 900	22115K24	000000	———	0
								16 × 25	4	900	UL 900	22115K26	000000	———	0
								20 × 20	4	900	UL 900	22115K28	000000	———	0
								20 × 25	4	900	UL 900	22115K32	000000	———	0
								24 × 24	4	900	UL 900	22115K15	000000	———	0
								30 × 30	4	900	UL 900	22115K27	000000	———	0

Made-to-Order Long-Life Reusable Mesh Panel Air Filters

If you need a long-life reusable filter with unique dimensions, we’ll get it made. These last longer than standard reusable filters thanks to a thicker frame and additional mesh layers. The frame also stands up to high airflow without warping. When your filter gets dirty, just wash and reuse it.

How to order:

Calculate the filter area you need by multiplying your filter length × width.
Find the thickness and filter area range you need.
Select the corresponding part number and enter your length and width.

For filters larger than 599 square inches, select 2150K999. Then enter the thickness, length, and width you need.

If you need help, feel free to call or email us. We answer our phones 24/7 within three rings.

	MERV Filter Rating	Frame Ga.	Max. Temp., ° F	Specs. Met		Each
1/2" Thick



	1 to 299	4	18	240	UL 900	2150K91	000000


	300 to 599	4	18	240	UL 900	2150K92	00000


	1" Thick



			1 to 299	4	18	240	UL 900	2150K93	00000


			300 to 599	4	18	240	UL 900	2150K94	00000


			2" Thick



					1 to 299	4	18	240	UL 900	2150K95	00000


					300 to 599	4	18	240	UL 900	2150K96	00000


					3" Thick



							1 to 299	4	18	250	UL 900	2150K75	00000


							300 to 599	4	18	250	UL 900	2150K81	000000


							4" Thick



									1 to 299	4	18	250	UL 900	2150K68	000000


									300 to 599	4	18	250	UL 900	2150K69	000000

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	2072K21	000000	2072K11	000000	2072K3	0000000


		19 1/8"	4	250	UL 900	2072K23	00000	2072K12	00000	2072K4	000000
		24 1/8"	4	250	UL 900	2072K25	00000	2072K13	000000	2072K5	000000


		1" Thick



				15 1/8"	4	250	UL 900	2072K22	00000	2072K14	00000	2072K6	000000


				19 1/8"	4	250	UL 900	2072K24	00000	2072K15	000000	2072K7	000000
				24 1/8"	4	250	UL 900	2072K26	00000	2072K16	000000	2072K8	000000