Varionix KK-series is designed for smaller applications or if there are several air handling units or the ionization systems are installed after VAV-boxes. A KK1-F with an F-tube can keep the indoor air of an office space up to 4,000 ft² or for example a gym's locker room size of 1,000 ft² clean of viruses and other contaminants, VOCs and odors. One KK2-F with two F-tubes can be used for up to 5,000 ft² of grocery store space or 8,000 ft² of an office space. The Active Bipolar Ionization works inside the space and also keeps the supply air coming from the air handling unit disinfected. You can find a KK1 device with a tube protective cover under the model name KD1.