Reduced total installed cost—fast, economical installation. • Core material will not support mold and mildew growth. • Long standard lengths help reduce waste—easily cut to exact lengths, or spliced, at the job. • Easily shaped to fit oval inlets. • Underwriters Laboratories Listed. • Large diameter, heavy, spring steel wire helix assures dimensional stability, resists mechanical abuse and provides more efficient air delivery. • All components of are self-extinguishing and will not support a flame (see oxygen index figures under application and engineering data). • Complies with NFPA Standards 90A and 90B and most local, state, and federal standards or codes. • Maintenance free under normal conditions—highly resistant to rust and corrosion. • Strict quality control over all raw materials and completed ducts. • Will not balloon at recommended operating pressure. • Unique construction will not unravel when cut. • “Outward Cast” of heavy spring steel wire keeps duct from shrinking up, resulting in better air flow and less waste. • Suitable for all bathroom and dryer venting applications. • Will not collapse at recommended operating pressure. • Assists absorbing system vibration transmitted through ductwork. • Packaged compactly for efficient transporting, storing and handling. • Available through broad national distribution. • Clean room approved.