The CD60 offers sturdy, steel construction with an interlocking frame design, enabling it to lock together without bolts, screws, or rivets that could shake loose. It also features:

• Frame corners that are internally braced to reduce racking.
• Axles that positively lock to blades without screws or welds.
• Non-stick, noncorrosive bearings that assure long life and ease of operation.
• Airfoil blades, which have greater strength, produce less sound, greater sealing ability, and static pressure loss.
• Concealed linkage to reduce turbulance, which provides lower pressure drop and reduces noise.