Manufacturers of electric heat and ventilation equipment.TPI Corporation | Manufacturers of Heating, Ventilation, Lighting, and Controls Current Product Offerings: Built-in Electric Heaters Duct Heaters & VAV Boxes Portable Electric Heaters Fostoria ? Infrared Heaters Fostoria ? Lighting Products Fostoria ? Process Heat Equipment Industrial Fans Thermostats & Controls Who We Are : Additional Links: >>TPI Customer Service<< TPI News & Miscellaneous Documents TPI Corporation Legal Disclaimer Fostoria Industries Non-Pricing Sites Below: http://www.markel-products.com http://www.raywal