ARM-S@NAV is the latest offering in our series of natural ventilation product line up. It incorporates unique technology that effectively utilizes wind force and gravity ventilation to allow natural air flow into a building. This product is very flexible and can easily be incorporated into the facade design of all building types under various design conditions. The product features facade surface ventilation and constant wind volume mechanism that enables natural air ventilation even on fix windows. Mullion with built-in constant wind volume mechanism is also a first in Japan.