‘What is a HEPA filter’ is a commonly asked question.<\/p>\n
A HEPA (High-Efficiency Particulate Air) filter is a specialised air filter designed to remove at least 99.97% of airborne particles as small as 0.3 microns. These filters are essential in environments where clean, particle-free air is critical, including healthcare, laboratories, cleanrooms, homes, transport, and highly controlled industrial spaces.<\/p>\n
HEPA filters are made from a dense mat of randomly arranged fibres (often fibreglass) and trap contaminants such as dust, allergens, bacteria, and even some viruses. To be classified as a true HEPA filter, it must meet strict industry efficiency standards (e.g., EN1822 or ISO 29463).<\/p>\n<\/div>
<\/p>\n
HEPA filters use a combination of three mechanisms to capture particles:<\/p>\n
The 0.3-micron particle size is known as the Most Penetrating Particle Size (MPPS) \u2014 the hardest size for filters to capture.<\/p>\n
If a filter can remove 99.97% of 0.3-micron particles, it will be even more effective at capturing both larger and smaller particles via the three mechanisms above.<\/p>\n
To help answer the question of what is a HEPA filter, it is important to understand where the HEPA filters are used. HEPA filters are used in a variety of settings where clean air is critical. Here are some examples:<\/p>\n
The replacement interval for HEPA filters depends on several factors, including:<\/p>\n
Typical practice is 6\u201312 months<\/strong> for high-demand or critical environments, and 1\u20133 years<\/strong> where contamination risk is low and performance remains stable. However, filters should be replaced early if:<\/p>\n Ultimately, a regular HEPA Filter Integrity Test<\/a> remains the most reliable way to confirm whether a filter is still performing as intended and safe to remain in service.<\/p>\n RJ Urmson Commissioning Engineers Ltd provides full HEPA filter integrity testing<\/a>, including DOP\/PAO testing<\/a> in accordance with ISO and EN standards.<\/p>\n<\/div> HEPA filters are essential in various applications where high air quality is paramount. At RJ Urmson Commissioning Engineers Ltd we offer a full range of HEPA filters suitable for air filtration in a wide range of applications including clean rooms, research and medical laboratories, pharmaceutical establishments, electro technology and micro technology sites.<\/p>\n<\/div> What is a HEPA filter? Are HEPA filters better than standard filters? Do HEPA filters remove viruses? How often should HEPA filters be replaced? What is HEPA integrity testing? <\/p>\n<\/div> For more information on how we can help with HEPA filter replacements, visit our HEPA Filter Integrity Testing Page<\/a> or get in touch with the team directly by completing our contact form<\/a> or calling on 01257 262683.<\/strong><\/p>\n<\/div><\/div><\/div><\/div><\/div> Learn what a HEPA filter is, how it works and why the 99.97% efficiency standard matters. Discover HEPA applications in healthcare, cleanrooms, homes and industry, plus guidance on testing and replacements.<\/p>\n","protected":false},"author":10,"featured_media":4991,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-4986","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rj-urmson-commissioning-engineers"],"_links":{"self":[{"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/posts\/4986","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/comments?post=4986"}],"version-history":[{"count":6,"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/posts\/4986\/revisions"}],"predecessor-version":[{"id":5314,"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/posts\/4986\/revisions\/5314"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/media\/4991"}],"wp:attachment":[{"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/media?parent=4986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/categories?post=4986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rjurmson.com\/rju\/wp-json\/wp\/v2\/tags?post=4986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
What Is HEPA Filter Integrity Testing?<\/h3>\n
\n
HEPA Filter FAQ and Summary<\/strong><\/h3>\n
\nFrom healthcare to homes, these filters play a critical role in trapping potentially harmful particles, thereby protecting health and ensuring safe, clean environments.<\/p>\n
\n<\/strong>A HEPA filter is a high-efficiency air filter that captures 99.97% of particles down to 0.3 microns.<\/p>\n
\n<\/strong>Yes, they are far more effective, particularly in medical, laboratory, and controlled environments.<\/p>\n
\n<\/strong>Yes, many viruses attach to larger particles, and HEPA mechanisms can capture them.<\/p>\n
\n<\/strong>Typically every 6\u201312 months in critical environments, depending on contamination levels.<\/p>\n
\n<\/strong>A certified testing process ensuring the filter is leak-free and performing to required standards.<\/p>\nFind out more about HEPA Filters<\/h3>\n