Trickle Ventilators (Passive Free Air Inlets)
Trickle ventilators have been a part of the building industry in European countries for decades. Introduced in Scandinavia in the early 1970s to attack the concern of indoor air quality and condensation forming on the glass and frames of windows, references to trickle ventilators are now contained in the Building Regulations in the United Kingdom. They are accepted as a supplemental means of natural ventilation as well as an addition to mechanical ventilation such as furnaces, air conditioners, and various types of fans. Both Washington State and Oregon reference the use of trickle ventilators in their Ventilation and Indoor Air Quality codes. Other states are also either considering or have adopted codes similar to Washington and Oregon.
More recently the USGBC LEED for Homes Project has also called for more outside air ventilation where Trickle ventilators meet this criterion perfectly. They are more controllable source of natural ventilation ideal for Advanced Outdoor Air Ventilation.
Buildings are being built tighter than ever before including very high performance windows. When you do that, you need a better ventilation system, because the air inside the building will get that more stale that much more quickly, as it isn’t getting in or out. Essentially, Trickle vents in the frames of the high-performance windows, give residents the option of letting a controlled amount of outside air into their home or apartments without opening windows. A Trickle ventilator is an excellent option that provides a much healthier indoor air environment in the home and gives the home occupants greater comfort and control.