Description
The Ferco Coil Spring Cassette C7 CF – Replacement Window Balance Spring is designed for use in PVC window balance systems that utilize Ferco’s Constant Force (CF) technology. Finished in white, this cassette helps counterbalance the window sash, allowing smooth and controlled window operation while helping the sash remain securely in position.
Part Number: SWH-620
Color: White
Type: C7 Long Tail – 7 lbs
System: Constant Force (CF)
Application: PVC Windows
This unit is classified as C7 Long Tail, which is designed to balance window sashes weighing approximately 7 lbs. In this system, the letter designation refers to the tail length, while the number indicates the sash weight capacity. Tail lengths are categorized as A = Short Tail, B = Medium Tail, and C = Long Tail, allowing installers to choose the appropriate configuration for different window designs.
These coil spring cassettes are stackable, allowing multiple components to be combined to achieve the proper balance for heavier window sashes. Installation typically begins with a short tail (A) cassette and progresses to medium (B) and long tail (C) components if additional balance is required.
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