Other non-ventilation engineering controls in general cover a range of control measures, such as guards and barricades, material treatment, or additives. One example is placing walk-off sticky mats at room exits.[1]:9–11[2] Antistatic devices can be used when handling nanomaterials to reduce their electrostatic charge, making them less likely to disperse or adhere to clothing.[3]:28 Water spray application is also an effective method for reducing respirable dust concentrations.[4]:16–17