With a firm commitment to quality, we are engaged in offering Negative Ventilation Exhaust Box Fan is utilized to ventilate a private or business space. It attempts to bring natural air from an external perspective and into the encased space. This item is utilized to haul abundance dampness and undesirable scents out of a specific room or region. Our offered Negative Ventilation Exhaust Box Fan helps haul hot ventilate of the room. Flipped the alternate way, it attracts air from outside.