bifolding doors for large openings

Are trickle vents needed in a new bifolding door?

If you are thinking about a new bifolding door for your home, you will either be replacing your old doors with a bifold or fitting one to a new extension or new build home.

In some cases, a trickle ventilator or trickle vent will be required. Every home is different, but what you should know is that trickle vents are part of the current Building Regulations.

What is a trickle vent and why might you need one?

For new build extensions a new bifold door will usually require a trickle vent.

For new build extensions a new bifold door will usually require a trickle vent.

Trickle vents have been widely used in domestic properties for some years already. For new windows and doors, it is a requirement and must be fitted.

Trickle vents came about to address the issues around poor ventilation in dwellings, moisture and creating a healthier and better living environment. As we strive to improve our homes, lower our heating bills and stop our heat from escaping, we have insulated our houses better than ever before.

An unfortunate byproduct of having well-insulated homes is that stale and moist air cannot escape. Here, trickle vents provide a solution.

How does a trickle vent work?

A trickle vent is a small device that is positioned at the head of a bifolding door. Some trickle vents are permanently open; others can be opened and close. What a trickle vent does is provide a clean, consistent and regular flow of air into the room.

The great thing about trickle vents is that they are not draughty. Some people assume that the airflow makes a room colder. This is not the case. The ‘trickling’ nature of the airflow is hardly noticeable, yet provides many benefits in a habitable room.

When are trickle vents required?

The requirements regarding trickle vents in windows and doors are simple.

For window replacements:

If you are replacing old doors and windows with new and these outgoing windows already have trickle vents, then the new windows will also require them.

For new build homes and new extensions:

If you are building a new extension current Building Regulations require you to provide ventilation. Trickle vents are one solution. Others are air bricks, purge ventilation, extraction or other approved method.

For new openings with bifolding doors, it is quite likely the doors will require a trickle vent at the head of the doors to meet the total area of ventilation for the size of the room. Building Regulations state that a habitable room needs 5000mm2 of background ventilation.

If you would like further information about how our advanced bifolding doors can enhance your home or new extension, please contact us.