AI Visibility Index: Industrial Filters in Illinois

When a buyer asks an AI assistant for a industrial filters supplier in Illinois, these are the companies that get named. This is what we found when the cell was last measured.

187 companies tracked
Last measured September 30, 2026
Next measurement October 30, 2026

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The headline numbers

Never named by AI

166 of 187

companies never appeared in a single buying question

They were asked the same 5 buying questions as everyone else in this cell and were not named once.

21 named at least once
166 never named

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Cell average: 0.18of 15
Across all 187 tracked companies.
Top ten average: 4.9of 15
The ten most visible companies in the cell.

A company's score is how many of the 15 measured answers named it.

The top ten in Illinois

These are the companies AI assistants named most often when Illinois buyers went looking for a supplier in this category.

Top 10 most AI-visible Industrial Filters companies in Illinois, measured September 30, 2026
Rank	Company	Location	AI visibility
1	Midwest Filter, LLC Illinois	Illinois	9 of 15 answers
2	Hatfield and Company – Chicago Office Illinois	Illinois	6 of 15 answers
3	CPE Filters, Inc. 10 employeesWoodridge, Illinois 2 name variants CPE Filter Systemsmost common4 CPE Filters (CPEF)1	Woodridge, Illinois	5 of 15 answers
4	Filter Services Inc Illinois	Illinois	5 of 15 answers
5	Pargreen Process Technologies Illinois	Illinois	5 of 15 answers
6	AJR Filtration Illinois 2 name variants AJR Filtrationmost common3 AJR Filtration (Clean Air Right)1	Illinois	4 of 15 answers
7	Chicago Filter Supply, Inc. Illinois	Illinois	4 of 15 answers
8	Durable Filter Manufacturing, LLC Illinois 2 name variants Durable Filter Manufacturing, LLCmost common3 Durable Filter Manufacturing (Durable Manufacturing Co.)1	Illinois	4 of 15 answers
9	Norman Filter Company Illinois 2 name variants Norman Filter Companymost common3 Norman Filter Company, LLC1	Illinois	4 of 15 answers
10	Advanced Filtration Systems 180 employeesChampaign, Illinois	Champaign, Illinois	3 of 15 answers

37 more companies were named at least once. Companies outside the top ten are counted in the averages but not named here.

Also named, based in another state

AI assistants named these companies too, but MacRAE'S lists them in a different state, not Illinois. They belong to that state's ranking, not this one.

Company	State	Mentions
Warco Inc.	Missouri	2 of 15
Camfil USA – Addison, IL	New Jersey	1 of 15
Liquid Process Equipment	Wisconsin	1 of 15
Olympia Maintenance, Inc. (OMI)	Alabama	1 of 15
Separation Technologies, Inc.	Indiana	1 of 15

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The five questions we asked

Every company in this cell is measured on the same questions, written the way a buyer would type them. That is what makes the ranking a comparison rather than a collection of anecdotes.

1“Best suppliers of industrial filters in Illinois”
2“Who supplies high-efficiency pleated HEPA filter cartridges in Illinois”
3“I need a Illinois industrial filtration partner for a continuous-duty chemical processing line, who should I talk to”
4“Top industrial filters suppliers in Illinois for plant maintenance and reliability buyers”
5“Which Illinois industrial filter manufacturers can handle custom housings rated for high-pressure corrosive media”
6“List 20 industrial filters companies in Illinois with their specialties.”the roster question

Each question is asked more than once, which is why a company's score is out of 15 answers rather than out of the number of questions.

Where AI drew its answers from

These are the sources the answers in this cell leaned on most, ranked by how many of the named companies each one stands behind.

thomasnet.comDirectory
5 companies
globalspec.comDirectory
4 companies
cleanair.camfil.us
3 companies
cpef.com
2 companies
durablefilters.com
2 companies
cleanairright.com
2 companies
cmlenterprisesinc.com
2 companies
drsperry.com
2 companies
hailera.com
2 companies
smithfilter.com
2 companies
midwestfilter.com
1 company
filtersbyacs.com
1 company

59 sources were cited across this cell's answers from 47 domains. A directory page often stands behind several companies at once; a company's own site usually stands behind one.

Illinois in context

Illinois ranks 13th of 21 measured states in this category. Each bar is the share of that state's tracked companies that AI assistants named at least once; across every measured state in this category the share is 12%.

Illinois (this report)Other measured statesCategory average (12%)

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