Description
P11.5 Anti-sidebow Chain: Design and Application Context
The P11.5mm pitch anti-sidebow chain is specified for window actuation systems where a smaller sprocket envelope is required than P12.75 allows, or where the actuator manufacturer has standardised on the 11.5mm pitch for their product line. The operating principle is identical to larger pitch variants: the chain stores in a curved magazine during the closed position and is driven outward by a powered sprocket to push the window panel open, then retracted by the same drive mechanism when the window is to be closed. The smaller pitch allows a tighter minimum bend radius in the storage magazine, enabling a more compact actuator housing for installation in narrow frame sections.
P11.5 chains are treated with a zinc-nickel alloy surface treatment that meets stringent outdoor corrosion resistance requirements — a critical factor for window actuation chains, which are typically installed in locations where they are exposed to condensation, rain penetration, and temperature cycling but are not practically accessible for regular maintenance lubrication. The zinc-nickel coating provides a self-protecting surface that remains functional for the 10–15 year service interval typical of automated building facade systems without requiring servicing.
P11.5 anti-sidebow chain for intelligent building window automation
Specifications — P11.5 Anti-sidebow Chain
| Chain No. | Pitch P (mm) | Pin Ø (mm) | Pin Length (mm) | Plate H (mm) | Plate h (mm) | Plate t (mm) | Q min (kN) |
|---|---|---|---|---|---|---|---|
| P11.5SB | 11.50 | — | 18.5 | 11.5 | 7.5 | 1.8 | 6.5 |
| P11.5SBF | 11.50 | — | 18.5 | 11.5 | 7.5 | 1.8 | 8.0 |
How the Push Mechanism Works
The drive unit consists of a small electric motor, a worm gear reducer, and an output sprocket whose teeth engage the P11.5 chain pitch. When the control signal opens the circuit, the motor drives the sprocket forward, feeding chain out of the curved magazine and pushing the window panel via an attachment point at the chain’s leading end. When the panel has reached the required open position — defined by a position sensor, a limit switch, or a timed stroke — the motor stops. To close, the motor reverses, retracting the chain back into the magazine and pulling the panel closed. The entire mechanism occupies a housing as narrow as 25mm, allowing concealed installation within standard window profiles.
In building management system integrations, the actuator receives open and close commands from the BMS via 24V DC signal or 0–10V analogue input for modulated positioning. Weather station integration allows automatic closing on rain detection and on wind speed exceedance — the chain actuator responds faster than pneumatic alternatives and requires no compressed air infrastructure. Battery backup is available for actuators in smoke exhaust applications where operation during power failure is required by EN 12101.
Installation Environments
P11.5 anti-sidebow chains are used in commercial, institutional, and high-end residential window automation. Office building atria with automated clerestory venting use these chains to manage thermal buoyancy ventilation — opening high-level windows when internal temperature exceeds setpoint and closing on rain detection. Hospital ward windows with infection control automation use P11.5 chains in slim-section tilt-turn window actuators where the hygiene requirement for smooth, cleanable surfaces rules out exposed mechanical linkages. Educational buildings with passively controlled ventilation strategies — stack effect and cross-ventilation driven by automated window operation — rely on the long-term maintenance-free performance that zinc-nickel treated push chains provide.
Components and Matching Parts
Customer Reviews
“We have installed P11.5 chains across 14 projects in the past 4 years — office buildings, schools, and one hospital ward block. The zinc-nickel treatment has performed without any corrosion issues across all sites, including a coastal school installation exposed to North Sea humidity. The chain dimensions are consistent and compatible with our standard actuator housing design.”
“Specified P11.5SBF for a passive ventilation strategy project — 340 actuated windows on a 12-storey residential building. The slimmer F variant allowed concealment within the frame depth without the thermal bridge that thicker actuator housings would create. Documentation for the building control submission was complete without needing additional information requests.”
“First time ordering anti-sidebow chains from this supplier. The technical support team identified the correct P11.5 variant for our GEZE actuator system from the actuator model number alone — saved us the time of sourcing the dimensional data independently. Delivery was 9 days from order, chains dropped straight into the housing without fitment issues.”
Frequently Asked Questions
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