{"id":16042,"date":"2026-10-15T15:57:40","date_gmt":"2026-10-15T07:57:40","guid":{"rendered":"https:\/\/www.hencolin.com\/?p=16042"},"modified":"2026-10-15T15:57:43","modified_gmt":"2026-10-15T07:57:43","slug":"how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs","status":"publish","type":"post","link":"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/","title":{"rendered":"How to Choose Chemical Filters: Key Procurement Considerations for Acid Gases, Ammonia, and VOCs"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u5927\u7db1<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#How_to_Choose_Chemical_Filters_Key_Procurement_Considerations_for_Acid_Gases_Ammonia_and_VOCs\" >How to Choose Chemical Filters: Key Procurement Considerations for Acid Gases, Ammonia, and VOCs<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Table_of_Contents\" >Table of Contents<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Translate_Odor_Concerns_into_Specific_Contaminant_Requirements\" >Translate Odor Concerns into Specific Contaminant Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Verify_the_Filter_Media_Type_Not_Just_the_V-Shaped_Design\" >Verify the Filter Media Type, Not Just the V-Shaped Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#How_to_Evaluate_Chemical_Filter_Test_Data\" >How to Evaluate Chemical Filter Test Data<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Consider_Dimensions_Sealing_and_Replacement_Criteria\" >Consider Dimensions, Sealing, and Replacement Criteria<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#What_Information_Should_You_Prepare_Before_Requesting_a_Quotation\" >What Information Should You Prepare Before Requesting a Quotation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Frequently_Asked_Questions_FAQ\" >Frequently Asked Questions (FAQ)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Can_a_standard_activated_carbon_filter_handle_acids_alkalis_and_all_VOCs\" >Can a standard activated carbon filter handle acids, alkalis, and all VOCs?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Does_the_V-shaped_design_of_a_chemical_filter_mean_a_higher_removal_efficiency\" >Does the V-shaped design of a chemical filter mean a higher removal efficiency?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#If_the_pressure_drop_is_normal_does_that_mean_the_chemical_filter_does_not_need_replacement\" >If the pressure drop is normal, does that mean the chemical filter does not need replacement?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.hencolin.com\/en\/air-filter-knowledge-installation-guides-hencolin\/how-to-choose-chemical-filters-key-procurement-considerations-for-acid-gases-ammonia-and-vocs\/#Can_a_filter_be_selected_based_only_on_the_presence_of_unpleasant_odors\" >Can a filter be selected based only on the presence of unpleasant odors?<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Choose_Chemical_Filters_Key_Procurement_Considerations_for_Acid_Gases_Ammonia_and_VOCs\"><\/span>How to Choose Chemical Filters: Key Procurement Considerations for Acid Gases, Ammonia, and VOCs<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>When unpleasant odors occur in a factory, or a process requires the control of gaseous molecular contaminants (AMC), procurement specifications often simply state \u201cactivated carbon filters.\u201d However, odors can originate from different gases, and the properties of acid gases, ammonia, and various volatile organic compounds (VOCs) differ significantly. Selecting a filter based solely on the presence of activated carbon may result in a filter with suitable dimensions but insufficient evidence of performance against the target contaminants.<\/p>\n\n\n\n<p>How should you select a chemical filter? Start by identifying the target gases, then verify the on-site concentrations, airflow, temperature, humidity, and control objectives. Next, ask the supplier to specify the corresponding filter media type and provide relevant test data. Pressure drop, price, and carbon content can all be included in the comparison, but none of these factors alone can demonstrate a filter\u2019s removal performance for a specific gas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Table_of_Contents\"><\/span>Table of Contents<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul>\n<li>Translate odor concerns into specific contaminant requirements<\/li>\n\n\n\n<li>Verify the filter media type, not just the V-shaped design<\/li>\n\n\n\n<li>How to evaluate chemical filter test data<\/li>\n\n\n\n<li>Consider dimensions, sealing, and replacement criteria<\/li>\n\n\n\n<li>What information should you prepare before requesting a quotation?<\/li>\n\n\n\n<li>Frequently Asked Questions (FAQ)\n<ul>\n<li>Can a standard activated carbon filter handle acids, alkalis, and all VOCs?<\/li>\n\n\n\n<li>Does the V-shaped design of a chemical filter mean a higher removal efficiency?<\/li>\n\n\n\n<li>If the pressure drop is normal, does that mean the chemical filter does not need replacement?<\/li>\n\n\n\n<li>Can a filter be selected based only on the presence of unpleasant odors?<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Translate_Odor_Concerns_into_Specific_Contaminant_Requirements\"><\/span>Translate Odor Concerns into Specific Contaminant Requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Descriptions such as \u201cacidic odor\u201d or \u201cchemical smell\u201d provide useful clues about site conditions, but they are not sufficient to determine the appropriate filter media. Procurement and engineering personnel should document process materials, emission sources, existing test results, and the times and locations where odors occur. Whenever possible, identify the target gases. Acid gases, ammonia or amines, and different types of VOCs should each be matched with filter media confirmed by the supplier to be suitable for the specific contaminants.<\/p>\n\n\n\n<p>If multiple contaminants are present at the same site, provide their combinations and known concentrations to the supplier. This helps prevent the test results for a single gas from being incorrectly applied to the entire facility. Filtration equipment should not replace source control. Inspect leaks, local exhaust systems, and ventilation pathways first, then determine which portion of the airflow needs chemical filtration. This approach helps establish clear procurement requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Verify_the_Filter_Media_Type_Not_Just_the_V-Shaped_Design\"><\/span>Verify the Filter Media Type, Not Just the V-Shaped Design<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Hanklin&#8217;s V-shaped chemical filter product page lists filter media options for acid gas removal, alkaline gas removal, and VOC removal, with applications including semiconductor manufacturing, microelectronics, and pharmaceuticals. When requesting a quotation, specify the target contaminants and the corresponding filter media model. Not all V-shaped filters should be assumed to contain the same media formulation.<\/p>\n\n\n\n<p>The product page also lists galvanized steel or plastic frames, along with operating conditions of no more than 40\u00b0C and a relative humidity of no more than 70% RH. Actual operating limits must still be verified against the technical documentation for the specific model being ordered and the measured conditions at the installation site.<\/p>\n\n\n\n<p>If the air intake is near a heat source or the system may experience condensation, provide temperature and humidity data before selecting a filter. Do not rely solely on assumptions about typical indoor conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Evaluate_Chemical_Filter_Test_Data\"><\/span>How to Evaluate Chemical Filter Test Data<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The performance of gaseous contaminant control cannot be demonstrated by particulate filter ratings such as MERV or HEPA classifications. At a minimum, evaluation documents should specify the test gas, inlet concentration, airflow or face velocity, temperature and humidity, and the method used to determine removal efficiency or contaminant breakthrough. Results obtained under different test conditions should not be compared directly without accounting for these differences.<\/p>\n\n\n\n<p>ISO 10121-2 specifies test methods for gas-phase air-cleaning devices used in general ventilation, while ASHRAE 145.2 provides a laboratory evaluation method for gas-phase air-cleaning devices. During procurement, ask suppliers whether they can provide relevant test reports based on these standards, and verify the differences between the test conditions and actual operating requirements.<\/p>\n\n\n\n<p>A statement that a filter has been \u201ctested according to a particular standard\u201d does not mean it will achieve the same removal efficiency for every gas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Consider_Dimensions_Sealing_and_Replacement_Criteria\"><\/span>Consider Dimensions, Sealing, and Replacement Criteria<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>When providing equipment opening dimensions, also confirm the actual filter dimensions, frame type, airflow direction, mounting and sealing methods, design airflow, and allowable system pressure drop. If air leaks around the filter, some of the airflow may bypass the filter media. Even when the media is suitable, such leakage can prevent the system from achieving its intended contaminant control performance.<\/p>\n\n\n\n<p>The service life of chemical filter media depends on factors such as inlet concentration, gas type, mixed contaminants, airflow, and humidity. Therefore, a single fixed replacement interval should not be applied to every facility.<\/p>\n\n\n\n<p>Consider establishing a monitoring and recordkeeping program for target gases upstream and downstream of the filter, based on process risks, and discuss replacement criteria with the supplier. Pressure drop helps track airflow resistance, but it cannot independently confirm whether the filter&#8217;s gas adsorption capacity has been exhausted.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Information_Should_You_Prepare_Before_Requesting_a_Quotation\"><\/span>What Information Should You Prepare Before Requesting a Quotation?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>We recommend preparing the following five categories of information:<\/p>\n\n\n\n<ol>\n<li>Target gases: Names, sources, and known concentrations of the contaminants.<\/li>\n\n\n\n<li>Operating conditions: Equipment airflow, daily operating hours, and intended installation location.<\/li>\n\n\n\n<li>Environmental conditions: Inlet air temperature, relative humidity, and the possibility of condensation.<\/li>\n\n\n\n<li>Filter specifications: Filter opening dimensions, available installation depth, and mounting requirements.<\/li>\n\n\n\n<li>Control objectives: Desired outlet concentrations or process control targets.<\/li>\n<\/ol>\n\n\n\n<p>If some information is not yet available, explain the known conditions and identify the measurements that still need to be taken. Ask the supplier to help determine what additional data is required.<\/p>\n\n\n\n<p>If your factory, laboratory, or HVAC system needs to control acid gases, ammonia, or VOCs, you can provide the information above to Hanklin and inquire about suitable V-shaped chemical filter media types, frame configurations, and test documentation.<\/p>\n\n\n\n<p>Final filter selection should always be based on the actual contaminants and operating conditions at the installation site.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_FAQ\"><\/span>Frequently Asked Questions (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_a_standard_activated_carbon_filter_handle_acids_alkalis_and_all_VOCs\"><\/span>Can a standard activated carbon filter handle acids, alkalis, and all VOCs?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>This should not be assumed. Different gases may interact with filter media in different ways, and their removal capacities and test conditions may vary. Provide the names of the target gases and verify the corresponding filter media type and test data with the supplier.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Does_the_V-shaped_design_of_a_chemical_filter_mean_a_higher_removal_efficiency\"><\/span>Does the V-shaped design of a chemical filter mean a higher removal efficiency?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The V-shaped design describes the filter&#8217;s structural configuration. Its appearance alone does not determine the removal efficiency for a specific gas. Performance data must still be evaluated based on the target gas, airflow, and test conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"If_the_pressure_drop_is_normal_does_that_mean_the_chemical_filter_does_not_need_replacement\"><\/span>If the pressure drop is normal, does that mean the chemical filter does not need replacement?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Not necessarily. Pressure drop reflects airflow resistance but cannot independently indicate whether gaseous contaminants have broken through the filter. Replacement decisions should incorporate target gas monitoring, operating records, and supplier recommendations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_a_filter_be_selected_based_only_on_the_presence_of_unpleasant_odors\"><\/span>Can a filter be selected based only on the presence of unpleasant odors?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Preliminary solutions can be discussed, but the contaminant sources and target gases should be identified before final selection. Airflow, temperature, humidity, and dimensional information should also be provided to reduce the risk of choosing unsuitable filter media.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to Choose Chemical Filters: Key Procurement Considerations for Acid Gases, Ammonia, and VOCs When unpleasant odors occur in a factory, or a process requires the control of gaseous molecular contaminants (AMC), procurement specifications often simply state \u201cactivated carbon filters.\u201d However, odors can originate from different gases, and the properties of acid gases, ammonia, and [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":16039,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[141],"tags":[],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Choose Chemical Filters: Key Procurement Considerations for Acid Gases, Ammonia, and VOCs - Hencolin International |Industrial Air Filter Manufacturer<\/title>\n<meta name=\"description\" content=\"\u5beb\u4f5cLearn how to select chemical filters for acid gases, ammonia, and VOCs. 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