External Trickle Vent Covers
External trickle vent covers protect the outside opening of a window vent, helping to deflect rain while allowing fresh air to enter the ventilation system. Also known as external trickle vent canopies, they are often replaced when the original cover has become cracked, faded, brittle or damaged, without needing to change the internal vent.
Our range includes genuine Titon and Brookvent external trickle vent covers in both durable uPVC and premium aluminium. Available in a wide choice of lengths, colours and ventilation ratings, they're suitable for many uPVC, timber and aluminium windows. If you're unsure which size you need, our Replacement Trickle Vent Size Guide explains how to identify the correct replacement.
Replacing the External Cover
In many cases the internal vent remains fully serviceable, meaning only the outside cover needs replacing. Matching the fixing centres, overall length and slot coverage is normally the best starting point when identifying the correct replacement.
If your installation must achieve a specific Equivalent Area (EA), we recommend pairing the external cover with its matching internal vent to maintain the manufacturer's tested airflow performance.
Weather Protection & Airflow
External covers play an important role in directing rain away from the routed slot while allowing background ventilation to continue. Depending on the model, they incorporate either an integral grille or a fine insect mesh to help reduce the entry of insects and debris.
No external vent cover can completely prevent insects from entering without restricting airflow, so the grille or mesh is designed to strike a balance between weather protection and ventilation.
Complete Your Repair
If you also need to replace the inside section, browse our range of replacement trickle vents. You can also explore our full collection of window vents and individual vent components to complete your repair.
Quick Tips & Links
Trickle vent canopies are individual units for the external side of the window only.
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