Extract units


Humidity sensitive PSV / Hybrid extract grille

Naturally effective extraction

The GHN humidity sensitive extract grille is the perfect solution for the passive stack and hybrid ventilation of wet rooms. Its robust and reliable humidity sensor ensures optimum performance at all the times, with remarkable longevity.

The GHN extract grille provides increased airflow when demand is high (as determined by the level of humidity), and reduced airflow when demand is low. This means of control prevents over ventilation during cold periods in winter, when thermal draught is at its greatest,  and offers a much improved energy performance over uncontrolled passive stack ventilation.

With the GHN grille (and humidity sensitive air inlets), passive stack systems can be classed “good practice”, (or “best practice” when used as part of a hybrid system) by the Energy Saving Trust’s Good Practice Guide (GPG268).