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Chemical Guide This list is fully protected by copyright. No part of it may be This chemical list is developed as a guideline to assist in reproduced in any forms or by any means – print, digital, the safe use and operation of ductless fume hoods. It is or mechanical including but not limited to photocopying, intended to assist in the control of health hazards and recording, or taping – without the written permission of Air should only be interpreted and applied by a person trained Science®. in an industrial hygiene discipline. It provides a philosoph- ical and practical basis for the uses and limitations of The operative source for Threshold Limit Values (TLV) is the carbon filters. American Conference of Governmental Industrial Hygienists (ACGIH). This resource is meant as a rough guide only. The information presented was gathered from the best avail- Always refer to the most current edition of “Threshold Limit able sources, including information from carbon suppliers, Values for Chemicals Substances and Physical Agents and results from in-house and external testing performed under Biological Exposure Indices” before using this chemical dynamic conditions, extrapolation from other available listing. data, and extensive engineering judgment. Actual values achieved will vary depending on environmental and opera- Ductless fume hoods provide operator protection. Use of tional conditions. All information is believed to be accurate hazardous material in these cabinets must be monitored as of printing date. We are not responsible for typographical by a qualified safety officer. Ductless fume hoods are not errors. While updates to this list are continuous, it is the intended for use with explosive, flammable or radiological responsibility of the user to contact us for the most current materials unless approved by a qualified safety officer data. following risk evaluation. Contact Air Science at info@air- science.com or 800.306.0656 for questions about individual applications. p:2 Chemical Guide How to Use this Guide Filter Options Filter Type / Formula Description Introduction PRE-Filter Filtrete high performance electrostatic material designed to remove Air Science Ductless Fume Hoods are a viable alternative to conventional fume particulates from the air stream, including aerosols and mists. 99% hoods that provide protection from toxic fumes to both laboratory personnel and the efficient for particle size 0.5 micron. Required on all units. environment. HEPA Filter A high-efficiency particulate air filter removes powders and particulates. Unlike conventional fume hoods, these cabinets filter out chemical fumes and recycle air directly back to the laboratory, providing energy savings, personnel and environ- GP Plus! Filter The most widely used filter in the range, primarily for solvent, organic, and alcohol fume removal. It is manufactured from mental protection. As there is no need for complicated ducting systems ductless fume coconut shell based activated carbon of 5-10 mesh. hoods are more convenient and more mobile. ACI Plus! Filter This alkali impregnated filter will neutralize volatile inorganic acid vapors, such as hydrochloric and hydrofluoric acids and acid gases You might have concerns over which filters to choose for specific chemicals, as there such as Sulphur and nitrogen dioxides. are hundreds of different types of activated carbon in the world and each is made for ACR Filter This filter is impregnated with halide salts and is used for the high different specific applications. Air Science has developed this Chemical Reference List efficiency removal of iodine and methyl iodide. It is frequently used to simplify the decision making process. This Chemical Reference List, combined with for iodination reactions with low level radioactive iodine. Efficiencies our Application Assessment Form, will ensure that you are using the right filter for your in excess of 99.99% have been measured. application. ACM Filter This filter is impregnated with iodine compounds for removal of mercury vapor. The filter has been demonstrated to remove mercury from a saturated air stream at ambient temperature to below 5 ppb How to use the Chemical Reference List in the exhaust air stream. Step 1 AMM Filter This filter is impregnated with copper compounds to efficiently remove vapor from dilute ammonia solutions, and to remove low Identify the chemicals most commonly used for your applications. The Chemicals molecular weight amines. are listed in alphabetical order. SUL Filter This is a potassium iodide impregnated filter designed to remove Step 2 hydrogen sulphide and low molecular weight mercaptans. For each Chemical, follow the row across for: CYN Filter This is a multi-impregnated filter to a military specification, for removal of hydrogen cyanide gas. Many cyanide compounds will evolve HCN gas if acidified, so this filter is normally specified if • Substance Characteristics working with any cyanide compound. • Comments (filtration notes and health affects) FOR Filter This filter is impregnated with an oxidizing agent to oxidize formal- dehyde and glutaraldehyde fumes. It is widely used in hospitals • Recommended Filter Selection pathology laboratories and endoscopy units. ETH Filter Diethyl ether is adsorbed on activated carbon but because of its low boiling point, the local heat adsorption can reduce the capac- ity of the filter. Special impregnation allows a chemical reaction which increases the filter capacity. EDU Filter This multi-layered filter is designed to handle chemicals normally used in a university level chemistry curriculum. MIL Filter This multi-layered filter is designed to handle chemicals normally found in military or Department of Defense applications. Air Science 120 6th Street • Fort Myers, FL 33907 • T/239.489.0024 • Toll Free/800.306.0656 • F/800.306.0677 • www.airscience.com p:3 Chemical Guide Filter Configurations Carbon Filtration Introduction Filters can be ordered in the following configurations: Fume hoods provide protection from fumes and vapors that are created by processes in the biotechnology, life sciences, forensic, and pharmaceutical industries. Fume Single One type of activated carbon. hoods can be ducted into an existing HVAC system or can be ductless. Blended A single filter with two or more types of carbon blended throughout. Ductless filtration systems provide highly efficient, sustainable protection in portable, Layered A single filter with two or more types of carbon in separate layers. standalone equipment that can fit in nearly any laboratory. The purpose of this appli- Stacked Some units allow for two or more single filters each with a different cation guide is to provide information on the proper use of the ductless fume hood. type of carbon. In addition to energy efficiency, capital investment savings and customizable filtration, ductless hoods can be designed for equivalent or safer performance than ducted Definitions Health Effects Abbreviations hoods. • OSHA TLV – Occupational Safety and • CNS – central nervous system Health Administration Threshold Limit • CVS – cardiovascular system There are, however, limitations to ductless technology and possible safety conse- Values quences from the misuse of ductless fume hoods. It is important to know recom- • CWP – coal workers’ pneumoconiosis • NIOSH TLV – National Institute for mended guidelines for ductless fume hoods and appropriate carbon filtration. Occupational Safety and Health • GI – gastrointestinal Threshold Limit Values Ductless vs. Ducted • TWA – Time Weighted Average Filter Recommendation System Laboratory ventilation should be examined from an overall perspective to achieve the • VME – Limit value in France (Valeur • × – Suitable for the primary carbon proper balance in terms of protection and cost. The table below summarizes the pros limite Moyenne d’Exposition) filter if installed and monitored and cons of ducted versus ductless fume hoods. properly, according to manufacturer • MAK – Limit Value in Germany specifications. Table 1 - Hood Type Comparison (Maximale Arbeitsplatz-Konzentration) • NR – Not suitable for ductless fume Ductless Fume Hood Conventional (Vented) Fume Hood • Olf – Olfactroy detection thresholds hood use. Call Air Science to discuss Handles limited quantity of chemicals Handles unlimited chemical quantity options for this type of chemical • ppm – parts of vapor or gas per million containment / protection. Handles limited types of chemicals Handles larger number of chemicals parts of contaminated air by volume Proper filters need to be used Does not utilize filters • Please call for details – This application • mg/m3 – milligrams of substance per can be suitable in certain instances Filters need to be closely monitored Does not utilize filters cubic meter of air but needs a thorough review to ensure No installation cost or ductwork Expensive installation and ductwork • f/cc – fibers per cubic centimeter fibers all safety precautions are followed. Flexibility in location of fume hood, can be Generally located on outside wall and difficult per cubic centimeter placed at point of actual use to move for relocation No loss of conditioned air Extensive make-up air required Substance Characteristics Fumes captured within filter and oxidized or Pollutants released to atmosphere in uncon- Definitions neutralized trolled fashion. • MW – Molecular Weight The conventional ducted fume hood is important for handling large quantities or • Bp – Boiling Point difficult to handle chemicals. Ductless fume hoods, however, provide
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