Portable ventilation systems

Samples taken near the exhaust of portable ventilation systems must be done with care. 

Stone, brick, and concrete cutting or chasing of concrete to install conduits can utilize water sprays on cutting wheels as a control technique. If this is not possible, effective fixed or portable ventilation systems can be connected to the tool, which include a suitable movable spring loaded hood. 

Portable ventilation systems (fans, filters and tents) should also be used in areas where airborne contamination may arise during maintenance, and provision should be made for sufficient space in which to operate such systems. 

Mobile exhaust or supply systems also include portable systems—for example, the systems consisting of a fan and a flexible tube used in construction work, either for exhausting or supplying air in work areas without any ventilation system. The work area must have some type of connection, such as windows, to the surroundings. 

Because most modem labs have adequate ventilation, asphyxiation is seldom a problem. However, when work is being done in a basement, in rooms that do not have an adequate ventilation system, or when a gas is heavier than air, every precaution should be taken such as the use of the buddy system, having portable air supplies available, and intercom systems with regular check-in times. 

Examples of local exhaust ventilation system are drawdown exhaust tables, slot hoods, dust extraction systems, and portable vapor and dust collectors. Care must be taken that the ventilation systems are utilized and maintained as designed. The condition of the filters and air flow rate should be checked periodically as well as the condition of the duct work, motors, belts, etc. 

Respiratory System Portable ventilators with backup power, oxygen equipment, portable suction equipment, and suction catheters... 

Portable air ventilation systems installed to provide the negative air pressure and air removal from the enclosure must be equipped with a HEPA filter. The number and capacity of units required to ventilate an enclosure depend on the size of the area to be ventilated. The filters for these systems should be designed in such a manner that they can be replaced when the air flow volume is reduced by the build-up of dust in the filtration material. Pressure monitoring devices with alarms and strip chart recorders attached to each system to indicate the pressure differential and the loss due to dust buildup on the filter are recommended. 

Dry sweeping and the use of compressed air is unsafe for the cleaning of floors and other surfaces where DBCP dust or liquids are found. To minimize the contamination of air with dust, vacuuming with either portable or permanent systems must be used. If a portable unit is selected, the exhaust must be attached to the general workplace exhaust ventilation system, or collected within the vacuum unit equipped with high efficiency filters or other appropriate means of contamination removal and not used for other purposes. Units used to collect DBCP must be labeled. 

The United States needs to improve and expand the uses of sensors in preventing terrorism and to minimize the impact should an incident occur. Besides point sampling devices, sensors to help provide sensitive and rapid detection and advance warning of toxic vapor at fixed sites such as subways, buildings, financial centers, and airports are of utmost importance. These sensors need to be operable around the clock. For example, sensors installed in the ventilation system could be coupled with a rapid shutdown procedure. Portable sensors to allow assessment from a remote or on-site point can be used to map the potential extent of the chanical cloud cover to aid authorities in organizing the movement of people. Current sensors have limited capabilities and must be improved. 

The ventilation system consists of 10 hoods, 08 being on the west side of the shed, associated with a misting system. The variables that make up the thermal environment, air temperature, Tair (°C), Relative Humidity, RH f/o), were collected simultaneously by the instrument Psychrometer-AN-4870 portable anemometer manufacturer ICEL and the noise level (dB) was collected by using a Thermo-Hygro-Luxmeter-portable decibel meter, model 400-THDL Instrutherm manufacturer. 

The Control Room Ventilation and Air Conditioning Systems are designed for uninterrupted safe occupancy of the control room during post accident shutdown in accordance with GDC 2, 4, 5, 19 and 60 (see CESSAR-DC, Section 9.4.1.1). Fire protection for the control room is provided by alarm systems and portable fire extinguishers (see CESSAR-DC, Section 6.4.1). The testing requirements for the Habitability System are identified in CESSAR-DC Sections 6.4.4 and 9.4.1.4. 

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