zirb.wooden ventilation systems filter dust and can also be used as humidifiers. Additionally, zirb. enhances concentration and neutralizes unpleasant smells such as sweat. Depending on the model, a zirb. can move 20 m³ to 70 m³ of air through the zirb.Curls - per hour. Thereby, the carved heart wood shavings of the Austrian stone pine not only filter the air but also distribute a pleasant natural scent all over the room. Always freshly carved from the heart wood of the Austrian stone pine the zirb.Curls are the centerpiece of your zirb. By exchanging them on a regular basis you can regulate the scent intensity. This is how you can sustain steady performance and effect over many years. With our patented zirb.Oil (add-on) your zirb. gets an additional scent boost and lasts for about two months. The zirb.Oil is specially designed for your ventilator and is free from dripping or leaking.