Snuffer Fire Extinguishers use ABC dry powder to provide fire protection to Protector and Basic Hoods. A fusible link melts at 155º F (68º C) and chemical powder automatically discharges within 5 seconds to extinguish the fire. A pressure gauge permits visual inspection. Rechargeable. A drilled hole is required in the hood liner. Labconco recommends factory installation. For quantities on specific hood sizes, please reference the manual. Contact Labconco for selection assistance based on your application, hood liner material, hood width and depth.