The Ferco Coil Spring Cassette C5 CF – Replacement Window Balance Spring is designed for use in PVC window balance systems that utilize Ferco’s Constant Force (CF) mechanism. Finished in white, this cassette helps counterbalance the window sash, allowing smooth and controlled opening and closing while maintaining proper window positioning.
Color: White
Type: C5 Long Tail – 5 lbs
System: Constant Force (CF)
Application: PVC Windows
Part Number: SWH-619
This unit is classified as Type C5 Long Tail, which is designed to balance window sashes weighing approximately 5 lbs. The letter designation indicates the tail length, while the number corresponds to the sash weight capacity. In this system, A = Short Tail, B = Medium Tail, and C = Long Tail, allowing installers to select the appropriate configuration for different window designs.
These coil spring cassettes are stackable, making it possible to combine multiple units to achieve the correct balance for heavier sash weights. Installation typically begins with a short tail (A) cassette and progresses to medium (B) or long tail (C) components as needed.
