Abstract: A kitchen exhaust system includes a dispenser and a receiver, with a supply spool of grease absorbent material provided in the dispenser. In a process to replace the contaminated material, portions of the web can be selectively removed from the air flow path into the receiver while drawing uncontaminated portions of the web from the dispenser to the path of air flow.

Abstract: A kitchen exhaust system includes a dispenser and a receiver, with a supply spool of grease absorbent material provided in the dispenser. In a process to replace the contaminated material, portions of the web can be selectively removed from the air flow path into the receiver while drawing uncontaminated portions of the web from the dispenser to the path of air flow.

Abstract: A kitchen exhaust air cleaning system includes a dispenser and a receiver, with a supply spool of grease absorbent material provided in the dispenser. Contaminated portions of the web can be selectively removed from the air flow path into the receiver while drawing uncontaminated portions of the web from the dispenser to the path of air flow.

Abstract: A water spray system applied directly to cooking units in a kitchen rather than to the ventilating duct for the cooking units. The system may be a wet system with water pressure maintained at spray nozzles which open in case of fire, or an open head, or dry, system controlled by thermostats and a solenoid water valve. Safeguards are provided against loss of water pressure, surges in the water supply line, flare ups after partial cooling of the thermostats, closing of a solenoid gas valve supplying gas burners in the cooking units as a result of momentary outages in the electric service supplying the control circuits, and other contingencies.