{"id":6106,"date":"2026-02-27T08:40:34","date_gmt":"2026-02-27T08:40:34","guid":{"rendered":"https:\/\/ingenic.es\/?p=6106"},"modified":"2026-08-04T17:34:31","modified_gmt":"2026-08-04T17:34:31","slug":"particle-and-pressure-control","status":"publish","type":"post","link":"https:\/\/ingenic.es\/en\/particle-and-pressure-control\/","title":{"rendered":"Particle and pressure control in controlled environments"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Particle and pressure control<\/strong> is the most critical and complex factor defining the quality, safety and regulatory viability of any controlled environment or <strong>cleanroom<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both parameters determine the air cleanliness class, process safety and compliance with international regulations such as <strong>ISO 14644<\/strong> and <strong>GMP<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Today we look at how suspended particles and air pressure are managed within a cleanroom, what systems are used, and why they are essential for guaranteeing the quality and sterility of the environment.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Why particle control matters<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Suspended particles, invisible to the naked eye, may contain microorganisms, dust or material residues that contaminate sensitive products or processes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even a minimal amount can affect the manufacture of pharmaceuticals, medical devices, microchips or cosmetics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s why cleanrooms are designed to minimize the presence of particles through ventilation, filtration and <strong>differential pressure<\/strong> systems.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">ISO 14644 classification: maximum permitted particle levels<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The maximum permitted level of airborne particles is defined by the ISO 14644-1 standard, which classifies cleanrooms according to the number of particles per cubic meter of air.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>ISO Class<\/th><th>Particle size \u22650.5 \u00b5m<\/th><th>Cleanliness level<\/th><\/tr><\/thead><tbody><tr><td>ISO 5<\/td><td>3,520<\/td><td>Very high (critical zone)<\/td><\/tr><tr><td>ISO 6<\/td><td>35,200<\/td><td>High<\/td><\/tr><tr><td>ISO 7<\/td><td>352,000<\/td><td>Medium<\/td><\/tr><tr><td>ISO 8<\/td><td>3,520,000<\/td><td>Basic<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The lower the ISO number, the stricter the air cleanliness. GMP (<em>Good Manufacturing Practices<\/em>) complement these requirements with microbiological limits and standardized operating procedures to guarantee sterility.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How particle concentration is controlled<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Particle control<\/strong> is based on three fundamental pillars:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Air filtration<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>HVAC<\/strong> systems incorporate <strong>HEPA<\/strong> or <strong>ULPA<\/strong> filters that capture up to 99.999% of microscopic particles. Filtered air is pushed into the room through laminar diffusers, creating a constant flow that carries particles toward the return grilles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Controlled airflow<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Air can circulate in a laminar (unidirectional) or turbulent (multidirectional) manner. Laminar flow is used in critical zones (ISO 5-6), where a constant air direction must be maintained. Air velocity and the number of air changes per hour are key parameters for maintaining the desired cleanliness level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Control of internal sources<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Particles can also be generated inside the room by staff movement, or the use of incompatible materials or equipment. That&#8217;s why clothing, cleaning and maintenance protocols are applied to prevent the generation and buildup of particles.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Pressure control in controlled environments<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pressure control<\/strong> is the other fundamental pillar of a clean environment. It is used to direct airflow and prevent the entry or escape of contaminants between different zones. Each area of the facility maintains a different pressure, creating a <strong>pressure gradient<\/strong> that ensures correct air direction.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Types of pressure: strategy for control and safety<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Room type<\/th><th>Pressure type<\/th><th>Objective<\/th><\/tr><\/thead><tbody><tr><td>Sterile cleanroom<\/td><td>Positive pressure<\/td><td>Prevents the entry of contaminated air from less-clean zones.<\/td><\/tr><tr><td>Biological or chemical containment room<\/td><td>Negative pressure<\/td><td>Prevents contaminants from escaping outside.<\/td><\/tr><tr><td>Intermediate zones or airlocks<\/td><td>Neutral or balanced pressure<\/td><td>Facilitates transition between areas of different classification.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The typical pressure difference between adjacent zones is usually 10 to 15 Pa, sufficient to ensure airflow direction without generating turbulence.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Continuous monitoring: real-time traceability and safety<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Modern controlled environments integrate <strong><a href=\"https:\/\/ingenic.es\/en\/control-and-instrumentation\/\" data-type=\"page\" data-id=\"5821\">cleanroom control and instrumentation systems<\/a><\/strong>, enabling continuous real-time monitoring of particle levels, temperature, humidity and pressure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Among the most commonly used equipment are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Optical or laser particle counters.<\/li>\n\n\n\n<li>Differential pressure sensors.<\/li>\n\n\n\n<li>Airflow and flow rate transducers.<\/li>\n\n\n\n<li>Logging and alarm software (<strong>BMS<\/strong> or <strong>SCADA<\/strong>).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These systems generate <strong>traceable<\/strong> reports and alert to any deviation from defined parameters, ensuring compliance with <strong>ISO<\/strong> and <strong>GMP<\/strong> standards.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Validation of particle and pressure control<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Before a cleanroom is commissioned, and periodically afterward, validation tests are carried out to confirm the system&#8217;s effectiveness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Notable examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Particle count test (according to <strong>ISO 14644-1<\/strong>).<\/li>\n\n\n\n<li><strong>HEPA\/ULPA<\/strong> filter integrity test.<\/li>\n\n\n\n<li><strong>Differential pressure<\/strong> testing.<\/li>\n\n\n\n<li><strong>Airflow<\/strong> visualization using smoke.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Results must comply with established limits and be documented for audits or regulatory inspections.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Benefits of effective control<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Implementing an efficient <strong>particle and pressure control<\/strong> system provides key advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Guaranteed regulatory compliance (<strong>ISO, GMP, FDA<\/strong>).<\/li>\n\n\n\n<li>Reduced risk of cross-contamination.<\/li>\n\n\n\n<li>Greater safety for staff and product.<\/li>\n\n\n\n<li>Energy savings through smart air control.<\/li>\n\n\n\n<li>Continuous environmental stability during production.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">At Ingenic, we integrate monitoring, filtration and pressure control systems into the design of our turnkey cleanrooms, ensuring maximum reliability and traceability on every project.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Without precise management of air and differential pressures, it is not possible to maintain classification or comply with international regulations.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Particle and pressure control<\/strong> is the foundation of every controlled environment. Without precise management of air and <strong>differential pressures<\/strong>, it is not possible to maintain cleanliness conditions or comply with international regulations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At <strong>ISL Salas Limpias<\/strong>, we design and install HVAC and environmental monitoring systems to guarantee absolute control of particles, temperature and pressure in certified cleanrooms.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Contact us and we&#8217;ll help you create a safe, efficient environment compliant with ISO 14644 regulations.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/ingenic.es\/en\/contact\/\">Contact now<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Particle and pressure control: discover the HVAC system, filters and pressure gradient essential for certifying purity (ISO 14644\/GMP) in your controlled environment.<\/p>\n","protected":false},"author":2,"featured_media":6105,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105,77,85],"tags":[],"class_list":["post-6106","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cleanroom-2","category-compliance","category-hvac"],"acf":[],"_links":{"self":[{"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/posts\/6106","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/comments?post=6106"}],"version-history":[{"count":2,"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/posts\/6106\/revisions"}],"predecessor-version":[{"id":6265,"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/posts\/6106\/revisions\/6265"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/media\/6105"}],"wp:attachment":[{"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/media?parent=6106"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/categories?post=6106"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ingenic.es\/en\/wp-json\/wp\/v2\/tags?post=6106"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}