12/27/2023 0 Comments Building airflow standard calculator![]() Install additional supply and/or exhaust fans if the existing system does not deliver sufficient outdoor air 7. back door) around exhaust fans closed to avoid short-circuiting of air flow.į. in toilets, kitchens) at full capacity to expel air from indoor spaces. The air distribution system should be balanced to ensure outdoor air provision to all intended spaces.Į. Open all air dampers and do not block air ducts to ensure optimal provision of outdoor air to all occupied spaces.ĭ. Deactivate demand control systems, such as those with CO 2 sensors, to avoid automatic reduction of outdoor air supply.Ĭ. Increase outdoor air supply rate to at least 10 L/s/person if the system can accommodate this 6.ī. Rectify faults detected.Ģ.2 Maximise ventilation for indoor air dilution:Ī. Maximise outdoor air intake and supply by setting AHUs/FCUs/PAUs/FAFs/EAFs to maximum speed and capacity with all air dampers (e.g. Check other systems to ensure there is no undesired air leakage into occupied spaces, including water seals in the sanitary system, cracks in pipes and ducts, and wall gaps. ![]() Used filters should be properly disposed of in sealed bags. Maintenance staff should wear the appropriate PPE, comprising at least N95 masks, eye protection, and gloves, especially when replacing filters.Į. Replacement of filters should be done during non-operational periods, with the ACMV system turned off. Recommended maintenance frequencies are specified in SS554:2016 Annex H. This includes inspecting and cleaning supply fans and exhaust fans to ensure optimal operation, checking air ducts and dampers to ensure no air leakages or blockages, and checking filter seals to avoid air bypass. Check all supply air diffusers and exhaust grilles to ensure airflow movement is in the correct direction.ĭ. Check AHUs/FCUs/PAUs/FAFs/EAFs 5 daily to ensure continuous operation, especially in occupied spaces.Ĭ. Use of sensors and systems for monitoring outdoor air supply rate should be considered.ī. Check ACMV systems to ensure adequate ventilation in all occupied spaces, based on at least the minimum outdoor air supply rates specified in Singapore Standard SS553:2016 Code of Practice for Air Conditioning and Mechanical Ventilation in Buildings 4. Indoor relative humidity should be closely monitored and maintained according to Singapore Standard SS554:2016 Code of Practice for Indoor Air Quality for Air-Conditioned Buildings.Ģ.1 Ensure that ventilation systems are in good working order:Ī. Managers should tailor the measures to each space, maximising ventilation while taking factors such as the type of ventilation system in the indoor space, the area of the indoor space, occupants’ thermal comfort, and relative humidity into consideration. Fans can be used to promote air circulation when needed.ġ.5 The recommended measures in this Guidance Note should be accompanied by other key measures to reduce disease transmission, such as requiring building occupants to practise safe distancing, wearing masks, and carrying out regular disinfection of high-touch points within the building 3.ġ.6 A comprehensive plan should be created for safe management of indoor spaces, including developing communication plans to garner support from occupants, increasing ventilation, and ensuring supply of critical items such as filters. Advice from subject matter experts and specialists should be sought for specialised premises.ġ.4 Occupants of residential homes may improve home ventilation by opening doors and windows, especially when hosting non-household guests. ġ.3 This Guidance Note applies to non-residential premises where air-conditioning is used intermittently or continuously, as well as to naturally ventilated premises, with the exception of specialised premises 2 such as certain factory production areas, hospitals, polyclinics, and laboratories. Earlier versions of this document were issued on and. It is aimed at reducing disease transmission amid the current COVID-19 situation and resurgence of community cases. Hence, it is critical to mitigate this risk by improving ventilation and air quality in indoor environments.ġ.2 This Guidance Note provides building owners and facilities managers with updated recommended measures to enhance ventilation and air quality in indoor spaces, through the proper operations and maintenance of air-conditioning and mechanical ventilation (ACMV) 1 systems. It can also be spread through virus aerosols in the air under certain settings, such as enclosed environments which are poorly ventilated. 1.1 COVID-19 is mainly transmitted by close contact and respiratory droplets which are released when an infected person coughs, sneezes, talks, or sings.
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