Wallner Expac is a 100% employee-owned company (ESOP) and North America's largest manufacturer of light gauge expanded metals ... for HVAC filtration. Since our inception in 1959, we have evolved from a simple tool and die shop into a state-of-the-art, world class US-based manufacturing entity with facilities in Georgia, Texas, and headquarters in Ontario, California. In 1975, Wallner Expac introduced a revolutionary new product to the filtration industry: expanded metal as a replacement for the welded wire used in pleated filters. Less expensive, lighter, and environmentally friendly, this expanded metal became the standard for pleated filter media backing and the filter industry recognized Wallner Expac as an industry leader and innovator. Innovation is in our DNA. Continuing to bring innovative products to market, in 2014 Wallner Expac introduced X-Mesh®, the industry new standard in expanded metal filter media backing. Awarded U.S. Patent No. 8,696,781 for X-Mesh®, it is available in various specifications to meet individual filtration requirements. In 2019, after many years of R&D, Wallner Expac introduced MicroForm® micromesh. Applications for this precision-engineered expanded metal include EMI/RFI shielding, microfiltration, lightning strike protection, anode & cathode material for standard and rechargeable batteries, and more. We continue to research, develop, and innovate new products to be used for a variety of applications. All our expanded metals are manufactured in our US-based plants for use many industries including Architecture, Solar, Battery Technologies, Construction, Arts & Crafts, Home Improvement, and of course, Filtration. We attribute our success to quality craftsmanship, a highly skilled work force, a dedicated management team, and our unyielding commitment to customer satisfaction. For more information on Wallner Expac, contact us at (909) 481-8800 or visit www.EXPAC.com. read more