Window trickle vents: yes or no?/ 07.08.2018
Window trickle vents: yes or no? Hints
No persuasion is needed about the importance of ensuring effective ventilation of the rooms. The lack of air exchange is the most common reason for the development of fungi, moulds, and dangerous microorganisms. In extreme cases, non-working ventilation combined with a faulty heating system may lead to tragedy. Owners of new and old buildings are increasingly interested in installing window trickle vents. Is this really a solution to problems with gravity ventilation?
What exactly is a window trickle vent?
It is a small device that is mounted on the upper frame of the window. Its task is to bring fresh air into the room. Gravity ventilation channels are responsible for the removal of used air.
Types of window trickle vents
Humidity controlled trickle vents are popular. Their advantage is that they do not require any service, due to automated operation. A polyamide tape that reacts to changes in humidity in the room. When the humidity rises (usually above 70%), the tape changes its length, which causes the throttle to open, and the fresh air starts flowing. Similarly, the damper closes when the air in the room is too dry (humidity drops below 30%).
Humidity controlled trickle vents
Pressure controlled trickle vents react to pressure differences inside and outside the room. The degree of opening increases with the increase of the pressure. The user has the option of manually blocking the air flow, which may be useful during a gale
Pressure controlled trickle vents
100% manual trickle vents
The user adjusts the opening, manually choosing the amount of air supplied, changing the position of the trickle vent damper. Manually operated trickle vent are used in places where regulations restrict the use of hygroscopic and pressure trickle vents
When using window trickle vents makes sense?
Definitely wherever only gravity ventilation was provided in the building. In summer, its effectiveness is very low, which means that it is necessary to force the air with opening of the windows. This involves the risk of draughts, poses problems with insects, and allows penetration of pollution into the rooms.
Advantages of trickle vents
Window trickle vents combined with efficient gravity ventilation ensure a high level of safety and significantly minimise the risk of asphyxiation.
Also, trickle vents may help reduce heating costs. They provide fresh air only when it is needed. In addition, the amount of cool air entering the room is much lower than with regular airing.