Use the force! The wind keeps it shut.
How does Ecoflap work?
The Ecoflap patented design ensures that whichever way the wind blows, Ecoflap blows itself shut and draught-proof. It is so effective it withstands 100mph winds yet the subtle difference in balanced forces means it can open with a single sheet of paper.
The force always pushes harder to close the Ecoflap rather open it. This is because pivoting in the middle, viewed from the front, the top of the flap has the larger surface area. Viewed from the rear the lower part is largest, so the Ecoflap is always presenting its largest area to the draught, which blows it shut, not open. This prevents rattling and ensures the Ecoflap shuts behind itself every time.
How do large parcels get through?
In additional to this smart but simple engineering, the flap will move completely up and out of the way when something is posted so large items such as Amazon book boxes pass through without being trapped or wedging the flap open. That means no more torn papers and parcels caught in springs. It also means parcels won’t sit wedged half in and half out all day, allowing cold air and damp to flow into your home.