Filter ventilation

Design internal filter ventilation for excessive flammable vapors... 

Kozlowski LT, Mehta NY, Sweeney CT, Schwartz SS, Vogler GP, Jarvis MJ, West RJ (1998) Filter ventilation and nicotine content of tobacco in cigarettes from Canada, the United Kingdom, and the United States, Tob Control 7(4) 369-375... 

Of all the design characteristics of cigarettes, filter ventilation may be the most important in determining machine-smoked yields (Djordjevic et al. 1995), as well as the most important determinant of the differences in machine-smoked yields and human smoking behavior and smoke exposure. Filter ventilation dilutes mainstream... 

A recent study demonstrated that increases in filter ventilation increased the relative proportion of free-base nicotine in the mainstream smoke when measured in an unblocked machine-smoked condition (Watson et al. 2004). The practical importance of these results is that, even without any compensatory smoking behavior, a ventilated cigarette may deliver a greater proportion of total nicotine in free base on a puff-by-puff basis. 

Perform daily assessment of the bedding conditions. While this is a standard procedure in most vivaria, some strains of diabetic mice such as BKS.Cg-w +/+ I.epfdh/] mice need additional attention because of related kidney problems, resulting in polyuria. Even with a HEPA-filtered ventilated caging system, mice caging may need to be changed two to three times weekly as the diabetic condition worsens. 

At the 58th TSRC, Loureau et al. (2400d) described the influence of cigarette paper and filter ventilation on the yields of Hoffmann analytes. ... 

Browne, C.L., C.H. Keith, and R.E. Allen The effect of filter ventilation on the yield and composition of mainstream and sidestream smoke 32nd Tobacco Chemists Research Conference, Program Booklet and Abstracts, Vol. 32, Paper No. 16,1978, p. 8 CORESTA1978 Symp., Sofia, Bulgaria, CORESTA Inf Bull., Spec. Edition 1978 Paper ST-01, 124 Beitr. Tabakforsch. Int. 10 (1980) 81-90. 

Morie, G.P. and M.S. Baggett Effect of filter ventilation on some physical and chemical properties of cigarette smoke CORESTA 1978 Symp., Sofia, Bulgaria,... 

Clean up spillage, carefully collect remainder (additional individual protection respirator with A/P2 filter). ventilate at floor level. R 22 S 2-24/25 VV H Harmful... 

The liquids collected on the bottom of the containment building are transferred by a sump pump (13) in the radioactive discharges tank (14) located in the auxiliary building (15). This building is provided with a filtered ventilation system. 

The basement floor plan for the facility is depicted in Figure 2.4-1. A three zone confinement and filtered ventilation system is used to control migration of radioactive contaminants in the basement processing areas. These zones are defined as follows ... 

Strive to identify persons with active tuberculosis. Provide medical surveillance at no cost to the employee, including preplacement evaluation, tubercnlosis skin tests, annual evaluations, and twice-yearly exams for those exposed. Evaluate and manage individuals with a positive skin test. Use acid-fast bacilli isolation rooms for those with active or snspected TB infection. Maintain such rooms under negative pressure and use outside exhaust or high-efficiency particulate air (HEPA)-filtered ventilation. Develop an employee information and training plan. 

The layout is divided into clean and potentially contaminated areas with directional ventilation, where air from potentially contaminated areas could leak to cleaner areas. Filtered ventilation by way of the stack is available for potentially contaminated rooms when needed. Electrical systems and process systems are separated fi om each other and located in different rooms and culverts. Process systems are similarly split into radioactive or non-radioactive systems. 

To withstand large SG leaks (a postulated rupture of several SG tubes, i.e., a beyond design basis initiating event), the gas system is connected with the passive heat removal system (PHRS) tank. The connection line is blocked by a membrane device designed for rupture under a gas system pressure of 1 MPa that is not dangerous for the reactor mono-block vessel. In the event of membrane rupture, the steam will be condensed in the water of the PHRS tank. In this, the volatile radionuclides of the cover gas remain in the tank water and the radioactive uncondensed gases will be released into the atmosphere via the filtered ventilation system. The radioactivity release will not exceed the permissible levels. 

N Exhaust air filter building Filters ventilation air froai the confineawnt zone of the 8 Reactor building before it is discharged to the atax>sphere. Reinforced concrete structure, alamt coayiletely below grade, 4,290 ft of enclosed space. 

Ventilation systems with appropriate filtration shall be provided for use in operational states and DBAs. For many research reactors filtered ventilation systems are essential to fulfil the function of confining radioactive material (see paras 6.120-6.130). 

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