GI Industries Inc. provides commercial tube cleaning machines for boilers, chillers, etc.; duct cleaning equipment, high pressure washers and industrial vacuums, and tube plugs, flexible shafts.

GrayWolf manufactures indoor air quality measurement instrumentation that helps optimize the balance between building energy savings and occupant performance, comfort and health. GrayWolf is dedicated to providing reliable, high quality products.

Regin HVAC Products Inc. are manufacturers of leak detectors, draft gauges, damper hardware, humidistats, expansion joints, air leakage testers, relay testers, leak test tools, hygrometers, and voltmeters.