The SPIRAmirâ„¢ self-sealing spiral duct system allows round duct and fittings to be joined without the use of duct tape or a sealant, the manufacturer states. According to the company, this system results in lower field installation costs. It can be used with the company's polyvinyl-coated ductwork (PCD), galvanized steel, or aluminum duct systems. It features a factory-installed O-ring with a temperature range of -20 degrees to 210 degrees F. If the O-ring is damaged, it can be replaced with a new O-ring.

Foremost Duct LLC, Attn: Sales Dept., 33106 W. Eight Mile Rd., Farmington, MI 48336; 248-615-8800; 248-615-8801 (fax);;

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