Exhaust air system

The agitated flash dryer (Fig. 12-106) consists of four major components feed system, drying chamber, heater, and exhaust air system. 

File exhaust air system must be protected from contamination by a filter of at least F5 (EU5) quality. 

What exhaust-air systems are available, do they function correctly and are they regularly serviced and maintained ... 

Intake air system Exhaust air system Internal air circulation Exhaust HEP A filter Static pressure gauge Heater current Positive pressure to entrance Even distribution of heat Belt speed recorder HEPA-filtered cooling air Exhaust HEP A filter Heater current Particulate control... 

The agitated flash dryer (Fig. 12-107) consists of four major components feed system, drying chamber, heater, and exhaust air system. Wet feed enters the feed tank, which has a slow-rotating impeller to break up large particles. The level in the feed tank is maintained by a... 

The potential for air leakage between the supply air and exhaust air as it passes through the wheel should be prevented. The relative pressures between supply and exhaust air systems should be such that the exhaust air system operates at a lower pressure than the supply system. 

Warning All components of the exhaust air system should be disassembled 30 minutes after shut down to avoid the human injury caused by hot parts. 

NFPA 90A prohibits means of egress corridors in healthcare occnpancies from being ntilized as a portion of supply-air, return-air, or exhaust-air systems serving adjoining areas. Conunercial cooking equipment should conform to requirements of NFPA 96, Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations. 

Finally a new system for monitoring of released radioactivity with the new exhaust air system was designed and built. Govemraoit authorities requested a system with advanced sensibility for low emissions of tritium and carbon-14. The design especially had to consider the highest mean time between failures and the lowest mean time to repair possible. 

The containment air filtration system consists of two 100 percent capacity supply air handling units, a ducted supply and exhaust air system with containment isolation valves and piping, registers, exhaust fans, filtration units, automatic controls and accessories. The supply air handling units are located in the south air handling equipment room of the annex building. 

The health physics and hot machine shop HVAC system is a once-through ventilation s> stem consisting of two integrated subsystems a supply air system and an exhaust air system. The systems operate in conjunction with each other to satisfy the functional requirements of maintaining temperatures in the areas served while controlling air flow paths and area negative... 

The exhaust air system consists of two 100% capacity exhaust fans sized to allow the system to maintain a negative pressure (see section 9.4.11.2.1 of Reference 6.1). 

Finally, in order for the ventilation system to work well, sufficient make-up air must be supplied to the areas from which contaminated air has been exhausted. Although the amount of make-up air must be equal to the volume of exhausted air, systems typically are designed to replace a 10% excess. Actual make-up air requirements will depend upon the operation and area being ventilated. 

In the production process, inadvertent reaction with moisture, acids, and heat may result in the release of small amounts of hydrogen sulfide. Therefore, an exhaust air system is recommended for handling cerium sulfide pigments. The exhaust air might also require scrubbing for hydrogen sulfide removal, and state, local and national regulations should be carefully consulted. 

Document the existing exhaust air systems to determine what exhaust fan modifications wiU be needed with the addition of exhaust air filters and energy recovery water coEs. These changes will have been identified in the original ECM assessment and would take into account the changing out of fan motor, motor starter size, etc., based on exhaust fan curves, performance data, and increase in fan system static pressure... 

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