Experimental study of airborne particle transmission through the doorway of a cleanroom due to the movement of a person

Reducing Morbidity and Mortality Rates from COVID-19, Influenza and Pneumococcal Illness in Nursing Homes and Long-Term Care Facilities by Vaccination and Comprehensive Infection Control Interventions

“…A study of pharmaceutical cleanrooms found that with the door from the anteroom closed, no particles entered the cleanroom due to the overpressure of 15 Pa and few particles entered with door opening and closing. When an individual entered the cleanroom walking fast at 1 m/s with low air flows (210 L/s), contamination was tripled compared to a lower speed of 0.5 m/s and a high air flow of 580 L/second [84]. Another study using a particle generator showed a marked increase in particle concentration within a patient room with the aerosol simulating coughing.…”

Pengukuran Partikel Di Cleanroom Tfme Politeknik Negeri Batam Menggunakan Standar Iso 14644-1

“…Cleanroom merupakan ruangan yang dirancang dan dibuat dengan menggunakan teknologi tertentu untuk dapat mengontrol konsentrasi partikel di udara dan partikel pembawa mikroba [1] [2] [3]. Cleanroom dapat melindungi produk elektronik, personal dan peralatan elektronik dari berbagai kontaminan udara melalui daerah yang bersih/kualitas udara yang bersih dan terkontrol.…”

Effectiveness of directional airflow in reducing containment failures in hospital isolation rooms generated by door opening

“…With a high enough supply-exhaust flow rate differential, the directional airflow may be sustained also across an open doorway. Although high directional airflows can be disturbed by the door opening motion, occupant movement, temperature difference, turbulence etc., they may still substantially reduce the air volume exchange and hence also the airborne contaminant dispersion through the doorway (Shaw, 1976;Hayden et al, 1998;Shao et al, 2020). Nevertheless, optimal airflow rates through doorways to control cross-contamination are still unknown and additional studies taking into account the effects of dynamic events (such as the door opening and occupant movement) when applying directional airflow are needed.…”

“…Studies investigating the effect of occupant movement in conjunction with a door opening are much more limited. However, it has been shown that the occupant movement can contribute notably to contaminant transmission through the doorway between adjacent zones (Shaw, 1976;Hayden et al,1998;Tang et al, 2013;Chang et al, 2016;Shao et al, 2020). For instance, Shaw (1976) estimated the amount of air that a fast and slowly walking person transfers through a doorway.…”

“…This thesis extended the scope of experimentally tested values of Shaw (1976) and Hayden et al (1998) to higher directional airflow (net flow) values but like discussed in the end of the previous section (4.2.5 Effect of ventilation), there seems to be only very limited amount of published experimental measurement data investigating the dynamic effects of door opening motion and occupant movement induced airflows on the air transfer across the doorway with a substantial directional airflow, against which the results obtained here could be compared. However, a recent study by Shao et al (2020) has investigated the effect of directional airflow across a cleanroom doorway in reducing a hinged door opening and manikin movement induced particle transmission into a cleanroom. They examined the effect of 210, 400 and 580 L/s airflow through the doorway with two walking speeds of a manikin passing through the doorway, thus extending the scope of the examined directional airflow rates to even higher values.…”