> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/naics/333994/ # NAICS code 333994: Industrial Process Furnace and Oven Manufacturing The companies classified under NAICS 333994, where they are based, how big they are and how the code maps to SIC. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** NAICS 333994 is the code for Industrial Process Furnace and Oven Manufacturing, in sector 31-33: Manufacturing. The companies counted under it are mostly small: 75% have 200 or fewer employees, and 48% are headquartered in the United States. ## What is NAICS 333994? NAICS 333994 is the code for Industrial Process Furnace and Oven Manufacturing. It belongs to sector 31-33: Manufacturing. NAICS, the North American Industry Classification System, is the standard U.S. government agencies use to sort businesses by what they mainly do, and each digit narrows the category. Most of the companies counted also carry SIC 3567, Manufacturing industrial furnaces and ovens, in the older SIC system (67%). NAICS is a North American system, so companies outside the US, Canada and Mexico are placed in it by classification. - 40% of the companies counted have 50 or fewer employees, and the middle one is in the 51 to 200 range. - The largest group is headquartered in the United States (48%). Within the US, Michigan is the biggest state (10%). - Most were founded in the before 1960 (34%), then the 1970s (17%). **Figure: How NAICS 333994 is built.** The code 333994 split into its parts: sector 33, then subsector, industry group, NAICS industry and U.S. industry. *The six digits of NAICS 333994. Each digit narrows the category.* ## Which companies are classified under NAICS 333994? The biggest by headcount range include Chromalox, Kanthal, Immergas S.P.A, Cordivari and Nabertherm. Names link to a company profile where we have one. | Company | Headquarters | Employees | | --- | --- | --- | | Chromalox | Pittsburgh, PA | 1,001 to 5,000 | | Immergas S.P.A | Reggio Emilia, Italy | 501 to 1,000 | | Cordivari | Doro, Italy | 501 to 1,000 | | Nabertherm | Lilienthal, Germany | 501 to 1,000 | | Wiesheu | Grossbottwar, Germany | 501 to 1,000 | | Tpi | Johnson City, TN | 501 to 1,000 | | Haydon | Wayne, NJ | 201 to 500 | | Bongard | Holtzheim, France | 201 to 500 | | Martin GmbH Für Umwelt- Und Energietechnik | Munich, Germany | 201 to 500 | | Aureus Energy Services | Southlake, TX | 201 to 500 | | Electronics Devices Worldwide | Mumbai, India | 201 to 500 | | Ajaxtocco Magnethermic | Warren, OH | 201 to 500 | | Heatron | Leavenworth, KS | 201 to 500 | | Ramalhos | Agueda, Portugal | 201 to 500 | | Middleby India Engineering Private | Bengaluru, India | 201 to 500 | | Sira Industrie | Pianoro, Italy | 201 to 500 | | Tempco Electric Heater | Wood Dale, IL | 201 to 500 | | Terra Universal | Fullerton, CA | 201 to 500 | | Winkler | Heidelberg, Germany | 201 to 500 | | George Koch Sons | Evansville, IN | 201 to 500 | | Louisville Dryer | Louisville, KY | 201 to 500 | | Tav Vacuum Furnaces | Caravaggio, Italy | 51 to 200 | | Preferred Utilities Manufacturing | Danbury, CT | 51 to 200 | | Sigma Thermal | Marietta, GA | 51 to 200 | | Sams Advanced Climatic Technologies | Hyderabad, India | 51 to 200 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## Where are NAICS 333994 companies based? The largest groups are headquartered in the United States (48%), Italy (15%) and Germany (11%). **Figure: Where companies in NAICS 333994 are based.** Bars for the share of counted companies in NAICS 333994 headquartered in each country: United States 48%, Italy 15%, Germany 11%, India 7%, Canada 6%, France 3%, United Kingdom 3%. *Share of counted companies in NAICS 333994 by headquarters country.* Within the United States, Michigan (10%), New Jersey (10%) and Ohio (10%) lead. **Figure: US headquarters of companies in NAICS 333994, by state.** A tile map of the United States shaded by the share of counted US companies in NAICS 333994 headquartered in each state. The largest are Michigan 10%, New Jersey 10%, Ohio 10%. *Share of counted US companies in NAICS 333994 by headquarters state. The three largest states are outlined.* ## How big are the companies counted for NAICS 333994? 40% of them have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. **Figure: Size of companies in NAICS 333994.** Seven columns for the share of counted companies in NAICS 333994 in each employee range: 11 to 50 40%, 51 to 200 35%, 201 to 500 18%, 501 to 1,000 4%, 1,001 to 5,000 2%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted companies in NAICS 333994 in each employee range.* ## How old are NAICS 333994 companies? Most were founded in the before 1960 (34%), then the 1970s (17%). **Figure: When companies in NAICS 333994 were founded.** Eight columns for the share of counted companies in NAICS 333994 founded in each era: Before 1960 34%, 1960s 9%, 1970s 17%, 1980s 11%, 1990s 12%, 2000s 10%, 2010s 7%, 2020s 0%. *Share of counted companies in NAICS 333994 by the era they were founded in, for the ones that list a founding year.* ## How NAICS 333994 compares - 40% of companies in NAICS 333994 have 50 or fewer employees, against 60% across all NAICS codes on this site. - 7% were founded in 2010 or later, against 30% across all NAICS codes on this site. - Michigan holds 10% of the US companies here, against 3% across all NAICS codes on this site. ## How do NAICS 333994 companies describe themselves? A code is assigned by classification, and a company does not choose its own, so the label a company uses for itself can differ. The most common labels here are Machinery Manufacturing (41%), Industrial Machinery Manufacturing (24%) and Appliances; Electrical; and Electronics Manufacturing (12%). **Figure: How companies in NAICS 333994 describe themselves.** Bars for the share of counted companies in NAICS 333994 that give each industry on their public profile: Machinery Manufacturing 41%, Industrial Machinery Manufacturing 24%, Appliances; Electrical; and Electronics Manufacturing 12%, Manufacturing 7%, Mechanical Or Industrial Engineering 6%. *Share of counted companies in NAICS 333994 by the industry they list on their public profile.* ## NAICS 333994 and the SIC system NAICS replaced SIC in 1997, but the two do not line up one to one: companies filed under one NAICS code can carry several SIC codes. These are the ones seen most. | Code | Title | Share of counted | | --- | --- | --- | | SIC 3567 | Manufacturing industrial furnaces and ovens | 67% | | SIC 3433 | Manufacturing heating equipment-nonelectric | 5% | | SIC 3559 | Manufacturing miscellaneous industry machinery | 4% | | SIC 3599 | Manufacturing industrial machinery | 4% | ## Where NAICS codes come from NAICS is maintained by the U.S. Census Bureau with Canada and Mexico and revised every five years; the current edition is NAICS 2022. To check exactly what a code includes, search the [official NAICS index](https://www.census.gov/naics/) or read the Census Bureau's [guide to understanding NAICS](https://www.census.gov/programs-surveys/economic-census/year/2022/guidance/understanding-naics.html). Pick a code by what a company mostly does, not by who it sells to. ## How do you reach the people at NAICS 333994 companies? The people to talk to are usually operations, supply chain and procurement leaders. You can build the list from this code in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the companies with NAICS code 333994 (Industrial Process Furnace and Oven Manufacturing) ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the operations, supply chain and procurement leaders at companies with NAICS code 333994, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Codes next to it: [NAICS 333914: Measuring, Dispensing, and Other Pumping](https://enrich.chat/naics/333914/)[NAICS 333922: Conveyor and Conveying Equipment](https://enrich.chat/naics/333922/)[NAICS 333924: Industrial Truck, Tractor, Trailer](https://enrich.chat/naics/333924/)[NAICS 333993: Packaging Machinery Manufacturing](https://enrich.chat/naics/333993/) Others in sector 31-33: [NAICS 325412: Pharmaceutical Preparation Manufacturing](https://enrich.chat/naics/325412/)[NAICS 326199: All Other Plastics Product Manufacturing](https://enrich.chat/naics/326199/)[NAICS 339112: Surgical and Medical Instrument](https://enrich.chat/naics/339112/)[NAICS 336390: Other Motor Vehicle Parts Manufacturing](https://enrich.chat/naics/336390/)[NAICS 332710: Machine Shops](https://enrich.chat/naics/332710/)[NAICS 312130: Wineries](https://enrich.chat/naics/312130/)[NAICS 333111: Farm Machinery and Equipment Manufacturing](https://enrich.chat/naics/333111/)[NAICS 334413: Semiconductor and Related Device](https://enrich.chat/naics/334413/) ## Frequently asked questions ### What is NAICS code 333994? NAICS 333994 is the code for Industrial Process Furnace and Oven Manufacturing, in sector 31-33: Manufacturing. ### What is the SIC code for NAICS 333994 (Industrial Process Furnace and Oven Manufacturing)? 67% of the companies counted carry SIC 3567 (Manufacturing industrial furnaces and ovens), but the two systems do not map one to one. ### Which companies are classified under NAICS 333994? The biggest by headcount range include Chromalox, Kanthal, Immergas S.P.A, Cordivari and Nabertherm. The page lists 25 with links to their profiles where we have them. ### Where are NAICS 333994 companies based? The largest groups are headquartered in the United States (48%), Italy (15%) and Germany (11%). ### How big are the companies in NAICS 333994? 40% have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. ### How do I find a company's NAICS code? Search the official NAICS index at the U.S. Census Bureau for the code that matches what the company mostly does. Public companies in the US also list a SIC code in their SEC EDGAR profile. ## Try this prompt Find the people at NAICS 333994 companies ```text Use www.enrich.chat to find the operations, supply chain and procurement leaders at companies with NAICS code 333994, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [NAICS 333914](https://enrich.chat/naics/333914/) - [NAICS 333922](https://enrich.chat/naics/333922/) - [NAICS 333924](https://enrich.chat/naics/333924/) - [NAICS 333993](https://enrich.chat/naics/333993/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)