{"id":18334,"feature_order":12,"feature_code":null,"name":"Air Filtration","type":"O","intent":"Reduce indoor and outdoor airborne contaminants through air filtration.","intervention":"This WELL feature requires projects with mechanically ventilated spaces to implement adequate air filtration and document a maintenance protocol for installed filters.","issue":"Exposure to particulate matter (PM) is associated with many negative health outcomes. PM10<\/sub> can block and inflame airways, causing a range of respiratory-related conditions that can lead to illness or death.1<\/sup> PM2.5<\/sub> poses even greater health risks compared to PM10,<\/sub> because it can penetrate deep into the lungs, enter the bloodstream and as a result, cause a variety of health issues, including heart disease and other cardiovascular complications.1<\/sup>","evidence":"Selection and installation of adequate media filters is one of the key mechanisms for minimizing exposure to outdoor and indoor air pollution. Studies have shown that decreased exposure to particulate matter by filtration of recirculated indoor air is associated with a reduced risk of cardiovascular disease and is an effective control measure for reducing allergic respiratory disease.2,3<\/sup> In addition, regular filter maintenance is critical to ensure proper air filtration and the efficiency of the air conditioning system. During the operation, filters should be replaced when they become loaded with particles, since they will begin to reduce airflow and increase pressure drop. Overloaded filters not only restrict airflow rate but can also result in a loss of filtration efficiency. It is also critical for projects to be aware whether the building is located in an area with elevated outdoor air pollution, since these projects often need to install a pre-filtration stage, in addition to the primary filtration, to maintain high-quality indoor air.4<\/sup>","implementation":"","impact":"","max_points":1,"concept_id":1734,"slug":"air-filtration-1","gbd_exists":null,"review_summary":null,"citations":"
  1. World Health Organization. Health Effects of Particulate Matter: Policy Implications for Countries in Eastern Europe, Caucasus and Central Asia. Geneva, Switzerland http:\/\/www.euro.who.int\/en\/health-topics\/environment-and-health\/air-quality\/publications\/2013\/health-effects-of-particulate-matter.-policy-implications-for-countries-in-eastern-europe,-caucasus-and-central-asia-2013.<\/li>
  2. Br\u00e4uner EV, Forchhammer L, M\u00f8ller P, et al. Indoor particles affect vascular function in the aged: An air filtration-based intervention study. Am J Respir Crit Care Med. 2008;177(4):419-425. doi:10.1164\/rccm.200704-632OC<\/li>
  3. Sublett JL. Effectiveness of air filters and air cleaners in allergic respiratory diseases: A review of the recent literature. Curr Allergy Asthma Rep. 2011;11(5):395-402. doi:10.1007\/s11882-011-0208-5<\/li>
  4. Centers for Disease Control and Prevention. Filtration and Air-Cleaning Systems to Protect Building Environments from Airborne Chemical, Biological, or Radiological Attacks. https:\/\/www.cdc.gov\/niosh\/docs\/2003-136\/default.html. Published 2003.<\/li>
  5. Stephens B, Brennan T, Harriman L. Selecting Ventilation Air Filters to Reduce PM 2.5 Of Outdoor Origin. ASHRAE J. 2016. http:\/\/www.conforlab.com.br\/wp-content\/uploads\/2016\/10\/2016Sep_012-021_HarrimanFiltersToReducePM2.5.pdf.<\/li>
  6. Camfil. Comparison Chart ASHRAE 52.2, 52.1, EN779, EN1882. https:\/\/www.camfil.com\/FileArchive\/Industries\/Gas turbines and other power systems\/Filter brochures\/Filter_class_chart_ASHRAE_EN2012.pdf. Accessed April 1, 2018.<\/li><\/ol>","deleted_at":null,"equivalency_count":13,"faq_count":1,"resource_count":0,"feature_full_name":"A12 Air Filtration","feature_faq_name":"A12 Air Filtration-v2","max_core_points":2,"parts":[{"id":30672,"name":"Implement Particle Filtration","part_number":1,"points":1,"possible_points":["1"],"core_points":2,"possible_core_points":["2"],"min_points":1,"rer_points":2,"wor_points":2,"parent_part_id":null,"feature_id":18334,"note":"

    The World Health Organization’s Global Urban Ambient Air Pollution Database may be consulted to view outdoor air quality levels, available at https:\/\/www.who.int\/data\/gho\/data\/themes\/air-pollution\/who-air-quality-database<\/p>","slug":"1-implement-particle-filtration-41","note_position_override":"bottom","new_core_shell":null,"existing_core_shell":null,"new_occupied":null,"existing_occupied":null,"education":null,"retail":null,"mfr":null,"others":null,"photographic_verification":0,"gbd_exists":0,"hospitality":null,"assisted_living":null,"cultural_institutions":null,"public_assembly":null,"deleted_at":null,"na_alternative":0,"na_alternative_text":null,"leed_well":1,"part_prefix":"A12.1","feature_name":"Air Filtration","parent":null,"sub_parts":[{"id":32958,"condition":"AND","part_id":30672,"deleted_at":null,"space_types_included":[{"id":1,"name":"All Spaces","name_plural":"all"}],"space_types_excluded":[],"options":[{"id":41832,"option_order":1,"name":"Filtration levels","description":"

    The following requirement is met:<\/p>","description_alt":null,"space_property":null,"certification":null,"note":null,"sub_part_id":32958,"deleted_at":null,"note_position_override":"top","verification_note":"

    Photographs should showcase:
    \r\n1) The installed filter. (It is not necessary to include the filter rating label in photographs.)<\/p>\r\n\r\n

    For situations where projects have restricted access to the installed filters, provide photographs of each type of spare\/replacement filter.<\/p>\r\n\r\n

    Quantity:
    \r\n1) At least one photograph of each filter type, up to a maximum of five filters.<\/p>","verification_condition":"AND","requirements":[{"id":120234,"option_id":41832,"requirement_order":1,"description":"

    Media filters are used in the ventilation system to filter outdoor air supplied to the space, in accordance with thresholds specified in the table below:5,6<\/sup><\/p>\r\n\r\n\r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t
      Annual Average Outdoor PM2.5<\/sub>Threshold  <\/strong><\/td>\r\n\t\t\t  Average Air Filtration Efficiency (particles 0.3-1 μm)  <\/strong><\/td>\r\n\t\t<\/tr>\r\n\t\t
    23 µg\/m³ or less<\/td>\r\n\t\t\t≥ 35% (e.g., MERV 12 or M6)<\/td>\r\n\t\t<\/tr>\r\n\t\t
    24–39 µg\/m³<\/td>\r\n\t\t\t≥ 75% (e.g., MERV 14, F8 or ePM1 75%)<\/td>\r\n\t\t<\/tr>\r\n\t\t
    40 µg\/m³ or greater<\/td>\r\n\t\t\t≥ 95% (e.g., MERV 16, E10 or ePM1 95%)<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>","description_alt":null,"deleted_at":null,"photographic_verification":0}],"verifications":[{"id":2,"name":"On-site Photographs","chinese_name":"\u73b0\u573a\u62cd\u7167","is_auditable":1,"scale_type":"Audited","note":null},{"id":11,"name":"Letter of Assurance \u2013 Engineer","chinese_name":"\u4fdd\u8bc1\u4e66\uff0d\u5de5\u7a0b\u5e08","is_auditable":0,"scale_type":"Shareable","note":"Project teams should complete all fillable fields in the PDF for LOA approval."}],"pvgbs":[]},{"id":41835,"option_order":2,"name":"Filter maintenance","description":"

    The following requirement is met:<\/p>","description_alt":null,"space_property":null,"certification":null,"note":null,"sub_part_id":32958,"deleted_at":null,"note_position_override":"top","verification_note":null,"verification_condition":"AND","requirements":[{"id":120238,"option_id":41835,"requirement_order":1,"description":"

    Evidence that the filter has been replaced according to the manufacturer's recommendation is submitted annually through the WELL digital platform.<\/p>","description_alt":null,"deleted_at":null,"photographic_verification":0}],"verifications":[{"id":17,"name":"On-going Maintenance Report","chinese_name":"\u6301\u7eed\u6027\u7ef4\u62a4\u62a5\u544a","is_auditable":1,"scale_type":"Audited","note":null}],"pvgbs":[]}]}],"on_sites":[],"annotated_documents":[],"letter_of_assurances":[],"part_guidances":[{"id":33085,"part_id":30672,"category":"WELL Core","sub_category":null,"rating_note":null,"alignment_note":null,"doc_guidance":"Meet these requirements in the whole building. Up to 10% of the total area occupied by tenants can be excluded from the feature scope.","points":null}],"methods":[]}],"ihmes":[],"sdgs":[{"id":3,"name":"3: Good Health and Well-being","max_points":0}]}