uPVC Window Trickle Vent – Background Ventilation for Aluminium & uPVC Frames | Shengxin

The uPVC Window Trickle Vent is a simple yet essential component for modern window systems. Designed to provide controlled background ventilation without the need to open the window, it allows fresh air to enter the room while maintaining security and weather resistance. Manufactured from UV-stabilised, impact-resistant uPVC, this vent is a durable, low-maintenance solution that complements both aluminium and uPVC window frames, making it the ideal accessory for fabricators and installers who want to offer a complete window package.

Building regulations across Europe and many international markets increasingly require trickle ventilation in new-build and replacement windows to maintain indoor air quality and prevent condensation. Our trickle vent fits into a standard 12mm or 14mm slot routed into the window frame or sash, and can be either snap-fitted or secured with screws for a rattle-free installation. An integrated slider or flap mechanism allows the occupant to adjust the airflow from fully open to fully closed, providing year-round control over ventilation while keeping insects and wind-driven rain out.

Shengxin, primarily known for its extensive range of aluminium extrusions for windows and doors, also supplies carefully selected glazing accessories like this uPVC trickle vent. This ensures that our window fabricator customers can source both the aluminium frame profiles and the essential ventilation hardware from a single, trusted partner. The vents are available in standard lengths of 250mm, 350mm, and 450mm, with custom lengths and colours available on request. Supplied in bulk with clear protective film, our uPVC trickle vents are ready to integrate into your window production line with minimal fuss.

Features & Benefits

• Durable uPVC construction: The vent body is extruded from UV-stabilised uPVC, providing excellent resistance to sunlight, temperature extremes, and moisture — it will not warp, discolour, or become brittle over the life of the window.
• Adjustable airflow control: A smooth-action slider or pivoting flap allows occupants to set the ventilation level according to their needs, from fully open (maximum airflow) to fully closed (minimum airflow with a sealed gasket).
• Effective condensation reduction: By providing a continuous, controlled air exchange, the trickle vent helps remove excess moisture from indoor air, reducing condensation on windows and the associated risk of mould growth.
• Insect and weather resistant: An integrated insect mesh prevents bugs from entering, while a baffled design stops wind-driven rain from penetrating the vent, even in exposed locations.
• Standard slot compatibility: Designed to fit 12mm or 14mm routed slots, the most common dimensions used by aluminium and uPVC window machinery, ensuring straightforward integration into your existing fabrication process.
• Available in popular colours: Stocked in white, brown, and beige to match common window frame finishes. Custom colour matching for larger orders is available to suit specific frame foils or paint colours.

Standard Vent Models & Airflow Performance

Select the vent length that meets the background ventilation requirements of your project. Equivalent areas are measured per EN 13141-1.

Equivalent area values are indicative and vary with the slider position. Vents can be combined for larger airflow requirements — for example, two V-250 vents in a large fixed window.

Technical Specifications

Selecting and Installing Trickle Vents

• Determining airflow needs: Building regulations typically require a background ventilation rate of 5000–8000 mm² equivalent area for habitable rooms. Use one V-450 or two V-250 vents to meet this requirement. For kitchens and bathrooms, higher ventilation rates may apply.
• Choosing the right slot width: Our vents are available for 12mm or 14mm slots. Most aluminium window machinery uses a 12mm slot cutter, but 14mm is also common on some uPVC fabrication lines. Verify your cutter size before ordering.
• Positioning the vent: The vent is typically installed in the head of the frame or sash, positioned so that incoming air is directed upwards to avoid draughts. For optimum performance, vents should be placed high on the window to encourage natural convection.
• Snap-fit vs. screw-fix: Snap-fit vents are quick to install and suitable for most residential applications. Screw-fix vents provide additional security for high-traffic areas or where forced-entry resistance is a concern. Both types are available in our range.
• Pairing with window frames: Our uPVC trickle vents are designed to complement aluminium window profiles — the neutral white or colour-matched finishes integrate seamlessly with the frame appearance.

Customisation & Supply Options

Why Buy Your Trickle Vents from Shengxin?

Shengxin is not just an aluminium extruder — we are a partner to window and door fabricators worldwide. By including uPVC trickle vents in our product range, we make it easier for you to source everything you need for a complete window from a single, reliable supplier. With 29 years of experience in the fenestration industry and a global logistics network spanning 97 countries, we understand the quality, delivery, and documentation requirements of professional window manufacturers.

Specify with Confidence: With 29 years of serving the window industry, Shengxin understands that even small components like trickle vents must perform reliably. Our technical team is available to help you select the right vent model and slot size for your window system.

uPVC Window Trickle Vent FAQ

Custom Trickle Vent Solutions

Need a specific length not in our standard range? A particular colour to match your frame foil? A different slot width? Shengxin can arrange custom production of uPVC trickle vents to meet your project's exact specifications, drawing on our network of audited uPVC extrusion partners.

How It Works:

1. Tell us your requirements — length, slot width, colour, and estimated annual quantity.
2. We source from our approved partners — vent bodies are extruded and assembled to your specification.
3. Receive a quotation — including unit pricing, tooling costs (if any), and lead time.
4. Approve a sample — we supply pre-production samples for your fit and finish approval.
5. Production and delivery — consistent quality, packed and shipped with your aluminium profile order if required.

⚠️ Important Note: All images and dimensional drawings on this page are for reference only. Final vent dimensions, colour, and airflow performance will be confirmed based on the approved pre-production sample. Please contact our team to discuss your specific requirements before placing an order.