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Window trickle vent | adjustable | with G3 filter | 350 mm | white | no-drill installation | 350LVB

Code: 37611

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The 350LVB is a supply-type window trickle vent (air inlet) designed to ventilate a room while the window stays closed. It is fitted directly onto the sash of a plastic or wooden window and lets outside air enter in a controlled way, preventing moisture build-up and the "sealed flat" effect typical of airtight PVC windows. It is used in living spaces, offices and other areas where additional natural ventilation is needed without constantly airing the window.

Product description

Window trickle vent | adjustable | with G3 filter | 350 mm | white | no-drill installation | 350LVB

The 350LVB is a supply-type window trickle vent (air inlet) designed to ventilate a room while the window stays closed. It is fitted directly onto the sash of a plastic or wooden window and lets outside air enter in a controlled way, preventing moisture build-up and the "sealed flat" effect typical of airtight PVC windows. It is used in living spaces, offices and other areas where additional natural ventilation is needed without constantly airing the window.

Key idea:
Airtight modern windows stop draughts, but they also stop the natural air exchange that used to happen through leaky seals. The result is increased humidity, a risk of mould and CO₂ build-up in the room. The trickle vent restores a controlled air supply path that can be adjusted as needed, or closed completely when not in use. It is a simple, inexpensive solution wherever a mechanical ventilation system is not installed or would not be cost-effective.

Type
supply (inlet) window trickle vent, adjustable

Length
350 mm

Filter
G3 (EU3) class

Installation
on the window sash, no drilling

Operating principle

The vent is fitted on the top or side edge of the window sash, at the point where a section of the existing seal is replaced (or reworked) – this creates a controlled air channel between the sash and the frame, instead of random leakage through the seal. Outside air enters the vent body through this channel, passes through the G3 (EU3) class filter, which catches larger dust particles, pollen and insects, and then continues into the room. The airflow is adjusted with a manual slider – from fully open to fully closed.

Physically, the vent does not generate airflow itself – it only opens and controls a path for air that moves due to the pressure difference between outdoors and indoors. This difference is caused by wind, temperature difference (thermal convection effect), and extract ventilation ducts or cooker hoods operating in the room, which create a slight negative pressure and "pull" air through the vent. When it is calm outside and the temperature difference is small, the flow through the vent naturally decreases – this is a physical property of natural ventilation, not a product defect.

What makes the 350LVB useful?
It maintains a basic air exchange without leaving the window ajar, preserving heat and sound insulation, while, when needed (for example, in winter when it is very cold outside), the vent can be fully closed with the slider. No-drill installation into the frame means the window does not lose the manufacturer's sealing and warranty characteristics at the frame structure.

Technical specifications

Model	350LVB
Product type	Supply (inlet) window trickle vent, adjustable
Material	Plastic
Colour	White
Length	350 mm
Width	17.9 mm
Filter	G3 (EU3) class
Adjustment	Slider, can be fully closed
Ventilation principle	Supply (air from outside into the room)
Installation	On the window sash, with self-tapping screws, no drilling
Suitable for windows	Plastic and wooden
Package contents	Vent, mounting kit, instructions
Warranty	2 years (manufacturer's)
Packaging	20 pcs per shipping box

Key features

Adjustable airflow – the slider lets you freely change the opening size from fully open to fully closed.
Air filtration – the built-in G3 (EU3) class filter catches larger particles, pollen and insects before air enters the room.
No-drill installation – fastened with self-tapping screws onto the sash, without compromising the window frame's airtightness.
Compact design – a body just 17.9 mm wide, with minimal visual impact on the window's appearance.
Full closure – the slider can be moved fully to the closed position when additional ventilation is not needed.
Universal fit – suitable for both plastic and wooden window sashes.

Where is it used?

Living spaces in flats and houses with airtight PVC windows
Bedrooms, where maintaining air quality without sleeping with the window ajar matters
Kitchens and bathrooms, supplementing existing extract ventilation
Offices and administrative premises with airtight windows
School and kindergarten classrooms, where additional basic air exchange is needed
Small commercial premises (shops, offices) without a mechanical ventilation system
Older buildings under renovation, fitted with new airtight windows
Storage or utility rooms, where minimal, controlled air exchange is needed

Use according to need

For residential users.
If, after replacing your windows, you notice moisture on the glass, stuffiness or signs of mould on the windowsills, the trickle vent is the simplest way to restore air exchange without replacing the window and without sacrificing heat insulation all the time, since it can be closed when needed.

For companies and industry.
In offices and small commercial premises, trickle vents are fitted at several window positions as a supplementary measure alongside existing extract ventilation, to reduce CO₂ concentration at workstations without an expensive mechanical system overhaul.

For electricians / engineers.
When designing ventilation, it is important to understand that the trickle vent is a passive element – its operation is governed by the pressure difference, so effectiveness requires functioning extract ventilation (ducts, cooker hoods) or natural convection. Installing trickle vents alone, without extraction, does not guarantee air movement.

Practical application

A typical case – in a two-room flat, after replacing the windows with new PVC units, condensation appears on the glazing and the bedroom air feels stuffy. After fitting one 350LVB vent on each of the bedroom and living-room window sashes (2 pcs total, installation time about 15–20 minutes per vent with a screwdriver, no drilling into the frame), with the slider kept slightly open, air enters the room through the filter, while the existing kitchen or bathroom extract fan draws it through – reducing humidity without keeping windows ajar during the cold season.

Pros

Simple installation – fastened with self-tapping screws directly onto the sash, no drilling into the window frame.
Adjustable – the slider changes the airflow or closes the vent completely.
With filter – the G3 (EU3) class filter catches dust and insects before air enters the room.
Requires no electricity or control – a fully mechanical, passive solution with no operating costs.
Compact – 17.9 mm wide, with little change to the window's visual appearance.
Universal – suitable for both plastic and wooden windows.

Cons / limitations

Airflow depends on the pressure difference (wind, temperature difference, functioning extraction) – without it, ventilation may be minimal.
The manufacturer does not specify an exact airflow (m³/h) value, so the actual ventilation rate depends on the specific conditions on site.
It is a natural ventilation device, not a mechanical heat-recovery system – it does not recover heat from outgoing air and does not replace designed mechanical ventilation where it is required by code.
The filter becomes dirty over time and must be periodically cleaned or replaced, otherwise airflow decreases.
In strong wind from a particular direction, the vent may let through more air than desired if it has not been partly closed with the slider in advance.

Safety and installation notes

Before installation, determine the most suitable spot on the sash – usually the top or side edge, where a section of the seal can be reworked.
Use the mounting kit included in the package and a screwdriver for installation – drilling into the frame is not required.
When driving the self-tapping screws, do not overtighten, to avoid bending the plastic housing.
After installation, check that the slider moves freely across the full adjustment range, including full closure.
Regularly (at least a few times a year) inspect and clean or replace the G3 filter to maintain airflow.
In winter, if the vent causes a noticeable draught or discomfort, reduce the opening with the slider rather than leaving it fully open.

Quick selection guide

Type
supply (inlet) window trickle vent, adjustable

Length
350 mm

Filter
G3 (EU3) class

Installation
on the window sash, no drilling

Suitable when you need:

to restore basic air exchange in an airtight flat or office after replacing windows;
an adjustable, closable ventilation opening on the window sash, without drilling into the frame;
a supplementary, passive ventilation device alongside functioning extract ventilation.

Check before use:

whether the window sash construction allows a section of the seal to be reworked for vent installation;
whether the room has functioning extract ventilation or another source of air movement that will "draw" the supplied air through;
whether the window is plastic or wooden (the vent is designed specifically for these types);
whether periodic filter cleaning or replacement is planned.

Important reminder:
The trickle vent is a passive, natural ventilation device. Its performance depends on outdoor conditions and the pressure difference, not on a fixed airflow rate, so in places where regulations require guaranteed mechanical ventilation, it should be used only as a supplementary, not a primary, measure.

FAQ

What is the airflow through the vent?
The manufacturer does not specify an exact m³/h value – the actual airflow depends on the pressure difference between outdoors and indoors and on the slider position.

Does the vent replace a mechanical ventilation system?
No. It is a passive, natural ventilation device that depends on outdoor conditions, not a guaranteed-flow system.

Do you need to drill the window frame during installation?
No, the vent is installed on the sash with self-tapping screws, reworking a section of the existing seal, without drilling into the frame.

How often does the filter need cleaning?
It is recommended to periodically (at least a few times a year) inspect and, if necessary, clean or replace the G3 filter so that airflow does not decrease.

Is it suitable for a wooden window sash?
Yes, the vent is suitable for both plastic and wooden windows.

Can the vent be fully closed in winter?
Yes, the slider allows the opening to be fully closed when additional ventilation is temporarily not needed.

Window trickle vent | adjustable

The 350LVB is an adjustable window trickle vent supplied with a G3 (EU3) filter, installed without drilling onto a plastic or wooden window sash. It is designed to restore controlled natural air supply in airtight windows, reduce the risk of moisture and mould, and can be fully closed with the slider when needed.

Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

Attributes

Manufacturer

Elsp Group

CE certificate – a guarantee of safety, quality, and compliance

This product is marked with the CE label, which confirms that it complies with all applicable European Union directives and regulations. CE marking is not just a formality – it is an important indicator of quality and safety, ensuring that the product has been properly assessed, tested, and can be safely used throughout the EU market.

CE certification means that the product has been evaluated according to the main criteria:

Safety requirements – ensures that the product does not pose a risk to the user or the environment
Electromagnetic compatibility (EMC) – the device does not interfere with other equipment and is resistant to external disturbances
Environmental standards – complies with current ecological and material usage requirements
Operational reliability – the product is suitable for long-term use according to its intended purpose

CE marking allows this product to:

be legally supplied and used in all European Union countries
ensure a high level of quality and safety
be used in residential, commercial, and industrial environments

The CE mark is a declaration of the manufacturer’s responsibility, confirming that the product complies with all applicable standards and has been assessed according to EU legislation.

What does this mean for you as a buyer?

Safe use in everyday activities
Reliable performance and reduced risk of failure
Compliance with EU standards and requirements
Suitability for professional solutions

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