Modular Cordless System
Spring Box Configuration Calculator
About This System
RL — Roller Shades
RL Spring Box
For roller shades. Spring box type is determined directly from the total load weight (fabric + tube).
ZE — Zebra Shades
ZE Spring Box
For zebra shades. Uses a selection weight formula — (load ÷ 2) + 100g — before looking up the table, to account for the dual-layer fabric.
Enter Weights
Units
Fabric Weight
g
Tube Weight
g
ZE formula: Selection Weight = (Fabric + Tube) ÷ 2 + 100 g (3.5 oz) — the table is looked up using this value, not the raw load weight.
Required Configuration
Spring Box Configuration
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—
Load Weight
—
Table Column Used
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⚖️ Bottom Weight Recommendation
Rule:
bottom weight + bottom rail > Load Weight ÷ 2
Minimum: > —
Tube Compatibility Reference
The Modular Cordless System is compatible with the 1½″ roller tube matching the cross-section parameters below. Please verify the tube meets these specifications before installation.
