Trickle Vents FAQs

A face-mounted trickle vent is a ventilation device fixed to the face of an aluminium window or door frame, allowing a controlled amount of background airflow into a property without needing to open the window.

Trickle vents are typically required to:

• Comply with Building Regulations (Approved Document F – Ventilation)
  • Provide continuous background ventilation
  • Reduce condensation and improve indoor air quality
  • Prevent mould growth in modern airtight buildings

Face-mounted vents are commonly used when:

• The aluminium profile does not allow integrated vents
• Retrofitting is required
• Structural integrity of the frame must not be compromised
• Larger airflow requirements are needed

They offer flexibility and are often the only compliant solution on slim aluminium systems.

Yes, when correctly specified and installed, face-mounted vents from manufacturers such as:

• RW Simon
• Brookvent
• Greenwood

These can all meet the required Equivalent Area (EA) airflow values under Approved Document F.

Face-mounted vents are visible externally and internally, unlike concealed options.

However, modern designs are low-profile and can be colour-matched. Powder-coated finishes can match aluminium frames.

When carefully positioned, it is possible to minimise the visual impact.

Yes. Most manufacturers offer a range of standard colours (white, black and grey). It is also possible to have RAL colour-matched vents to suit your aluminium frames.

Installing a high-quality vent will minimise draughts through controllable openings. They include internal baffles to reduce noise transfer.

However, due to their purpose, minimal airflow and sound transfer are unavoidable.

Yes, face-mounted trickle vents typically include manual open and close controls, as well as adjustable airflow settings.

However, it is important to note that regulations may require them to be capable of being left open.

Yes, face-mounted vents can be installed on the following, where they are required to meet ventilation regulations:

• Aluminium windows
• Sliding doors
• Bi-fold doors
• Fixed frames

Due to the slim sight lines of the Ultraline Slim Sliding Door, it is not possible to have trickle vents.

However, it is possible to lock the door in a semi-open position of 100mm, to ventilate the room without compromising on security.

When trickle vents are installed correctly, they are designed to remain weathertight. External canopies can prevent water ingress without compromising the performance of the system.

Yes. One of the major advantages of face-mounted vents is that they can be retrofitted to existing aluminium frames. They can also be installed without replacing the window or door.

This depends on:

• Room type (Is it a habitable room, or a kitchen or a bedroom?)
• Floor area
• Number of windows/doors

Your installer will calculate the required Equivalent Area (EA) to ensure compliance.

Yes, commonly used manufacturers include:

• RW Simon
  • Brookvent
  • Greenwood

All offer a range of sizes, airflow capacities, and finishes suitable for aluminium systems.

Trickle vents only require minimal maintenance. They will benefit from occasional cleaning to remove dust and debris, to ensure that openings are not blocked.

Not always. If your property has systems such as MVHR (Mechanical Ventilation with Heat Recovery), then trickle vents may not be required. This should be confirmed at the design stage.

Yes, it is possible to have an integrated trickle vent. The RW Simon Airstrip 19000 is an integrated trickle vent that sits within the glazing zone, rather than being cut into the aluminium frame.

The Airstrip 19000 is installed between the frame head and glass unit for a cleaner aesthetic and improved performance.

Find more information below on the RW Simon 400 and the RW Simon 19000.

Yes, integrated trickle vents can be considered the premium of the two options when it comes to trickle vents.

Being integrated, they deliver a much cleaner, more discreet appearance with no visible plastic components. Perfect for those seeking an incredibly sleek, modern aesthetic.

They also avoid the need to cut into the frame, helping maintain structural integrity and improving thermal performance by reducing cold bridging and condensation risk. In addition, integrated vents typically achieve higher airflow in shorter lengths, offer better acoustic performance, and provide stronger resistance to wind-driven rain.

Face-mounted vents can still be useful in retrofit situations, but for new installations, particularly slimline or premium systems, integrated vents offer clear advantages in performance, aesthetics, and overall quality.