The company now manufactures both HEPA and ULPA Microguard 99 filters with 99.97 percent, 99.99 percent and 99.999 percent efficiencies on 0.3 microns. Standard capacity and high-capacity models are available. A variety of cell-side materials are offered, including wood, steel and aluminum with other options to meet specific operating conditions. Every filter is individually tested to assure rated performance, the company said. The media is wet-laid paper, produced from microglass fibers, that is waterproof and heat resistant to 1,000°F.

Airguard, P.O. Box 32578, Louisville, KY 40232; (502) 969-2304; fax (502) 961-0930;