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Proportion-Air, Inc.

Proportion-Air is an Indiana-based manufacturer with a global reputation for quality and excellence in industrial automation. We seek to understand every customer’s application and build a product tailored to the specific process. We build our products to your specifications, whether you need one device or thousands. Offering free application and technical support, we strive to quote within 6 hours of understanding your needs.


Mindy Schoeff
McCordsville, Indiana


  • Precision electro-pneumatic pressure regulators
  • Flow controllers
  • Volume boosters
  • Miniature pressure regulators
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