{"id":2989,"date":"2026-09-22T06:57:13","date_gmt":"2026-09-22T06:57:13","guid":{"rendered":"https:\/\/www.bionicsscientific.com\/blogs\/?p=2989"},"modified":"2026-09-22T06:57:13","modified_gmt":"2026-09-22T06:57:13","slug":"dynamic-pass-box-sop","status":"publish","type":"post","link":"https:\/\/www.bionicsscientific.com\/blogs\/dynamic-pass-box-sop\/","title":{"rendered":"Dynamic Pass Box SOP"},"content":{"rendered":"<h2><b>Quick Answer<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A <\/span><b>dynamic pass box<\/b><span style=\"font-weight: 400;\"> is a HEPA-filtered transfer chamber between two clean rooms that uses its own blower to force air through a HEPA filter, keeping the chamber positively pressurized every time a door opens. A <\/span><b>static pass box<\/b><span style=\"font-weight: 400;\"> has no independent air handling\u2014it simply holds whatever pressure cascade already exists between the two rooms. This <\/span><b>dynamic pass box SOP<\/b><span style=\"font-weight: 400;\"> covers the interlocking sequence, purge cycle, and cleaning steps operators must follow at every transfer.<\/span><\/p>\n<h2><b>Dynamic vs. Static Pass Box<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A <\/span><b>pass box in pharma<\/b><span style=\"font-weight: 400;\"> and cleanroom settings solves one problem: moving materials between rooms of different cleanliness classes without opening a direct door between them. A <\/span><b>pass box clean room<\/b><span style=\"font-weight: 400;\"> unit has two interlocked doors\u2014only one opens at a time\u2014which blocks a direct air path between environments.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Static pass box<\/b><span style=\"font-weight: 400;\">: no independent filtration; relies on the surrounding rooms&#8217; pressure cascade. Suited to lower-risk transfers between similarly classified rooms.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Dynamic pass box<\/b><span style=\"font-weight: 400;\">: fitted with a blower, HEPA filter (typically 99.97% efficient at 0.3 microns), and usually a UV-C lamp that runs between transfers to reduce bioburden.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Which one you need is dictated by the room classifications and material risk profile in your facility&#8217;s clean room qualification documentation\u2014not by preference.<\/span><\/p>\n<h2><b>How It Works<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Air passes through a pre-filter and HEPA filter, then discharges into the chamber in a laminar pattern, holding it at positive pressure relative to the lower-classification side. The UV lamp is interlocked to shut off whenever a door is open and runs during the idle, closed state for surface disinfection.<\/span><\/p>\n<h2><b>Step-by-Step SOP<\/b><\/h2>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pre-use check.<\/b><span style=\"font-weight: 400;\"> Confirm both doors are closed and interlocked; verify the differential pressure gauge is within its validated range.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Airflow stabilization.<\/b><span style=\"font-weight: 400;\"> Run the blower for the stabilization period in your validated SOP before the first transfer.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Disinfect the item.<\/b><span style=\"font-weight: 400;\"> Wipe the item&#8217;s exterior with an approved disinfectant before loading\u2014the pass box filters air, not surfaces.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Load from the dirty side.<\/b><span style=\"font-weight: 400;\"> Open only the lower-classification door; confirm the interlock blocks the opposite door.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Close and hold.<\/b><span style=\"font-weight: 400;\"> Run the UV\/purge dwell cycle (commonly 10\u201315 minutes, but set per your facility&#8217;s validation) before opening the second door.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Unload from the clean side.<\/b><span style=\"font-weight: 400;\"> Remove the item and close the door immediately.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Log the transfer.<\/b><span style=\"font-weight: 400;\"> Record time, item, and pressure reading per your GMP documentation.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Post-use cleaning.<\/b><span style=\"font-weight: 400;\"> Wipe interior surfaces each shift; watch for rising differential pressure signaling filter loading.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Requalify periodically.<\/b><span style=\"font-weight: 400;\"> Re-verify HEPA integrity (DOP\/PAO), airflow velocity, and interlock function on your facility&#8217;s validation schedule.<\/span><\/li>\n<\/ol>\n<h2><b>Applications<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Pharmaceutical formulation and filling suites, sterile API handling, injectable manufacturing, biotech labs, hospital pharmacies, and electronics clean rooms all use dynamic pass boxes wherever airborne particulate control matters more than simple pressure cascading. Facilities running a [<\/span><a href=\"https:\/\/www.bionicsscientific.com\/blogs\/vertical-laminar-air-flow\/\"><span style=\"font-weight: 400;\">laminar airflow workstation<\/span><\/a><span style=\"font-weight: 400;\">] or [<\/span><a href=\"https:\/\/www.bionicsscientific.com\/blogs\/biosafety-cabinet-class-2\/\"><span style=\"font-weight: 400;\">biosafety cabinet<\/span><\/a><span style=\"font-weight: 400;\">] alongside a pass box should qualify both under the same clean room package. In pharma, the pass box is typically part of the facility&#8217;s IQ\/OQ\/PQ documentation as a barrier-system component.<\/span><\/p>\n<h2><b>Specifications<\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td><b>Parameter<\/b><\/td>\n<td><b>Typical Range (Manufacturer-Specified)<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Chamber sizes<\/span><\/td>\n<td><span style=\"font-weight: 400;\">300\u00d7300\u00d7300 mm to 900\u00d7900\u00d7900 mm (custom available)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Filtration<\/span><\/td>\n<td><span style=\"font-weight: 400;\">HEPA, 99.97% efficiency at 0.3 microns<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Airflow pattern<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Unidirectional, top-to-bottom, or horizontal<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">UV-C lamp<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Optional\/standard; interlocked off when a door is open<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Door interlock<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Mechanical or electromagnetic<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Construction<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS 304\/316 interior; powder-coated or SS exterior<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Viewing panel<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Toughened glass<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Power supply<\/span><\/td>\n<td><span style=\"font-weight: 400;\">220\u2013240V AC, single phase<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Confirm exact dimensions and filter grade against your unit&#8217;s own datasheet.<\/span><\/p>\n<h2><b>Pressure Chart<\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td><b>Zone Relationship<\/b><\/td>\n<td><b>Typical Differential Pressure<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Pass box vs. adjoining lower-class area<\/span><\/td>\n<td><span style=\"font-weight: 400;\">10\u201315 Pa positive (facility-specified)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Clean room vs. corridor (reference)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">10\u201315 Pa positive<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Grade A\/B vs. Grade C\/D (pharma cascade)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Per site&#8217;s HVAC validation<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Cascade pressures are governed by <\/span><a href=\"https:\/\/www.iso.org\/standard\/53394.html\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">ISO 14644<\/span><\/a><span style=\"font-weight: 400;\"> and your facility&#8217;s own HVAC qualification\u2014never treat these as universal fixed figures.<\/span><\/p>\n<h2><b>Why Bionics Scientific<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A pass box becomes part of your facility&#8217;s documented barrier system and shows up in your audits, so a supplier&#8217;s certification scope matters directly to your compliance file. Bionics Scientific has manufactured clean room and laboratory equipment for 35 years, certified under ISO 9001:2015, CE (MDD 93\/42\/EEC), and GMP, with clean room equipment explicitly named in the certification scope. Our dynamic pass boxes are supplied across the USA, UK, UAE, Saudi Arabia, South Africa, Canada, Australia, Singapore, Malaysia, the Philippines, Indonesia, Kenya, Nigeria, Bangladesh, Nepal, Qatar, Oman, Kuwait, Bahrain, Vietnam, Thailand, Tanzania, Ghana, Sri Lanka, New Zealand, and across India.<\/span><\/p>\n<h2><b>Get a Quote<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Need a dynamic pass box built to your facility&#8217;s exact pressure cascade, size, and validation requirements? <\/span><a href=\"https:\/\/www.bionicsscientific.com\/contact-us.php\"><span style=\"font-weight: 400;\">Contact Bionics Scientific&#8217;s engineering team<\/span><\/a><span style=\"font-weight: 400;\"> for a technical consultation and quotation.<\/span><\/p>\n<h2><b>Related Searches<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Pass box price in India, dynamic pass box vs static pass box, pass box for clean room GMP, HEPA filter for pass box, pass box interlocking system, clean room pass box manufacturers, and pass box validation protocol.<\/span><\/p>\n<h2><b>TL;DR<\/b><\/h2>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A dynamic pass box actively filters and pressurizes its own air; a static pass box does not.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The interlock allows only one door open at a time, blocking direct air exchange.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The SOP centers on pre-use pressure checks, the UV\/purge dwell cycle, and transfer logging.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Standard in pharma, biotech, and hospital clean rooms wherever particulate control is critical.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dwell times, pressure ranges, and filter grades must match your facility&#8217;s own validation documents.<\/span><\/li>\n<\/ol>\n<h2><b>FAQs<\/b><\/h2>\n<p><b>What is the difference between dynamic and a static pass box?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A dynamic unit has its own blower and HEPA filter to actively purify chamber air; a static unit relies entirely on the surrounding rooms&#8217; pressure difference.<\/span><\/p>\n<p><b>When is a dynamic passbox required over a static one?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When rooms differ significantly in classification or the material carries a higher contamination risk, confirm against your clean room qualification protocol.<\/span><\/p>\n<p><b>How long should the purge cycle run?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p>The purge cycle duration is set by your facility&#8217;s validation study, typically lasting 10\u201315 minutes, but this should never be treated as a fixed industry standard.<\/p>\n<p><b>Can both doors open at once?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No\u2014the interlock is specifically designed to prevent this.<\/span><\/p>\n<p><b>Does it need periodic requalification?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Yes\u2014HEPA integrity, airflow velocity, and interlock function on your facility&#8217;s validation schedule.<\/span><\/p>\n<p><b>What HEPA efficiency is standard?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Typically 99.97% at 0.3 microns; confirm against your model&#8217;s datasheet.<\/span><\/p>\n<p><b>Is a UV lamp mandatory?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Commonly fitted for bioburden reduction, but mandatory status depends on your facility&#8217;s own risk assessment.<\/span><\/p>\n<p><b>Can it replace a laminar airflow unit?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No\u2014a pass box transfers materials; it isn&#8217;t an aseptic workstation.<\/span><\/p>\n<p><b>What documentation should accompany the SOP?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">IQ\/OQ\/PQ records, HEPA test certificates, interlock verification, and a transfer log or batch record entry.<\/span><\/p>\n<p><b>How is it cleaned?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Wipe interior surfaces each shift with an approved disinfectant and monitor filter differential pressure regularly.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick Answer A dynamic pass box is a HEPA-filtered transfer chamber between two clean rooms that uses its own blower 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