Introduction
This document describes a simple and efficient solution for limiting drafts and heat loss in homes through the use of an Airflow Controller for Wall vents (ACW). It highlights the product's features, installation process, and compatibility with existing systems.

Specifications
- Automatically limits airflow to reduce drafts and heat loss.
- Compatible with 4” soil pipes (110mm OD) and 100mm OD ducts.
- Constructed with silicone flaps, PS base, and PVC tube.
- No electricity or maintenance required.

Functionality
The ACW is designed to automatically adjust airflow in response to wind conditions. Two silicone flaps reduce the pipe's open area when wind speed exceeds a certain threshold, effectively controlling drafts and heat loss.

Installation and Compatibility
- Easy to install and ideal for retrofitting existing ventilation systems.
- Specifically adapted for 4” soil pipes commonly found in wall openings in Ireland.

Performance
The document includes a graph comparing airflow with and without the controller, demonstrating its effectiveness in reducing airflow and pressure.

Additional Recommendations
The Aereco EHT humidity-controlled wall vent is recommended as a complementary product to the ACW. It adjusts its open area based on room humidity and occupancy, further enhancing ventilation efficiency without requiring power or maintenance.

Conclusion
The ACW and EHT products offer a practical solution for improving home ventilation, reducing drafts, and minimizing heat loss, with over 3 million installations worldwide.