A system for preparing paper for a cementitious panel, the system comprising:
- a calender stack, the calender stack including a source of an antimicrobial composition, the antimicrobial composition including an antimicrobial additive, the calender stack being adapted to apply a coating of the antimicrobial composition to the paper;
- a rewinder, the rewinder disposed within an operational area including particulate-laden air, the rewinder including a cutting roll adapted to cut to a predetermined width the paper having the coating applied thereto, the rewinder including a roll over which the cut paper is positioned by winding the cut paper upon the roll, the particulate-laden air comprising particles produced by cutting the paper at the rewinder station, the particles comprising the antimicrobial additive;
- an exhaust collection assembly, the exhaust collection assembly including a rewinder collection plenum disposed at the operational area, the rewinder collection plenum being disposed in proximate relationship to the rewinder, the rewinder collection plenum defining an intake opening, the intake opening being wider than the width of the cut paper;
- a wet scrubber assembly, the wet scrubber assembly in fluid communication with the rewinder collection plenum of the exhaust collection assembly, the wet scrubber assembly including a venturi scrubber, a separator, an exhaust fan, a pump, and a supply of fluid, the venturi scrubber being in fluid communication with, and interposed between, the rewinder collection plenum and the separator, the exhaust fan being adapted to draw particulate-laden air from the operational area into the rewinder collection plenum and to direct the particulate-laden air to the venturi scrubber as a flow of particulate-laden air, the venturi scrubber being adapted to receive the flow of particulate-laden air from the operational area via the exhaust collection assembly, the venturi scrubber being in fluid communication with the pump to receive the supply of fluid therefrom, the venturi scrubber being configured such that the flow of particulate-laden air received from the operational area passes through the supply of fluid inside the venturi scrubber to entrain particulate from the flow of particulate-laden air in the supply of fluid and to create a flow of an exhaust/liquid mixture, the venturi scrubber being adapted to direct the flow of the exhaust/liquid mixture to the separator, the separator being adapted to separate liquid with entrained particulate from the exhaust/liquid mixture to produce a cleaned exhaust air stream and a drain flow of liquid with entrained particulate, the separator having an air outlet and a liquid outlet, the air outlet of the separator being in fluid communication with the exhaust fan, the exhaust fan being adapted to draw the cleaned exhaust air stream from the separator via the air outlet toward the exhaust fan, and the separator being configured such that the drain flow of liquid exits from the separator via the liquid outlet.