Heat Recovery Ventilation

is the intentional introduction of outdoor air into a space. Ventilation is mainly used to control indoor air quality by diluting and displacing indoor pollutants; it can also be used to control indoor temperature, humidity, and air motion to benefit thermal comfort, satisfaction with other aspects of indoor environment, or other objectives.

The intentional introduction of outdoor air is usually categorized as either mechanical ventilation, natural ventilation,[2] or mixed-mode ventilation (hybrid ventilation).


Mechanical ventilation is the intentional fan driven flow of outdoor air into a building. Mechanical ventilation systems may include supply fans (which push outdoor air into a building), exhaust fans (which draw air out of building and thereby cause equal ventilation flow into a building), or a combination of both. Mechanical ventilation is often provided by equipment that is also used to heat and cool a space.

  • Natural ventilationis the intentional passive flow of outdoor air into a building through planned openings (such as louvers, doors, and windows). Natural ventilation does not require mechanical systems to move outdoor air. Instead, it relies entirely on passive physical phenomena, such as wind pressure, or the stack effect. Natural ventilation openings may be fixed, or adjustable. Adjustable openings may be controlled automatically (automated), controlled by occupants (operable), or a combination of both.
  • Mixed-mode ventilationsystems use both mechanical and natural processes. The mechanical and natural components may be used at the same time, or at different times of day, or in different seasons of the year.[3] Since natural ventilation flow depends on environmental conditions, it may not always provide an appropriate amount of ventilation. In this case, mechanical systems may be used to supplement or regulate the naturally driven flow.

Residential Ventilation

  • Ventilation and dehumidification Unit
  • Recessed residential ventilation
  • Residential ceiling / wall ventilation

Non-Residential Ventilation

  • High efficiency non-residential ventilation
  • Standard efficiency non-residential ventilation