In a Spring Chain System, the main difference from the Pulley Chain system is the addition of a spring to support the retraction of the blind. The blind is controlled by a Ball Chain, passing through a Control which rolls the blind up and down.
Since the Spring Chain System has an additional spring to support the retracting of the blind, it is able to support a larger dimensions as compared to the Pullet Chain System.
Ideal maximum dimensions is Max Width: 2.2m/ Max Height 4.0m or Max Area 6m², whichever is smaller.
Any dimension larger than the max dimensions would not have any warranty for the operation of the entire system of the blind.