Aarsha Chemicals Private Limited

Padgha, Raigad, Maharashtra

GST No. 27AABCA2026J1Z0

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Covid- 19 Guidance document for Air-conditioning & Ventilation for Commercial Facilities

Source-lSHRAE (Indian Society for heating, Refrigerating & Air Conditioning Engineers) covid-19 guidelines

Recommendations for starting centralized air-conditioning systems after long shut down due to Covid and in normal operations

  • 1. Get the office area sanitized


2. Clean the AHU filters. For cleaning the filters use 5% Cresol solution (containing 50% Cresol and 50% Liquid soap solution). Mix 1litre of this solution in 9 liters of water. The filter surface shall be sprayed with this solution, left for 10 minutes and then washed I wiped clean with water/cloth.


  • (Regular operations - clean the filter once a week with above process.)
  • 2. Ocean the Condenser drain pan/tray. Disinfect it using 1% sodium hypochlorite dosing.

    (Regular operations - clean the condenser drain pan once in two weeks with above process.)

  • 2. Oean the AHU coils. Follow standard recommendations of coil cleaning and then sanitize the same using the same protocol as that of the filters specified above.

    (Regular Operations - clean the AHU coils once in a month using same process.)

  • Start the AHUs keeping return air set point as 30°C keeping fresh air vents open and run the

    Same for 2 hours.

    (Regular operations - Run AHUs with above mentioned arrangements for max 30 mins.)

  • 6. Start the chiller and AHUs 2 hr before the office start time. AHUs to start with 30°C set point. AHUs set point to be changed from 30°C to 24°C after 30 mins operations and Fresh Air vents needs to be shut off.

    (Regular operations - The same process needs to be followed in regular operations.)

  • 7. Office Temperature to be maintained between 24 to 30°c as per the requirements.


  • 8. Maintain relative humidity between 40% and 70%. { In humid Climates set temperature closer to 24°C for de - humidification and in Dry Climates closer to 30°C.)


    9. Toilet and Kitchen/pantry Exhaust Fans must be kept in operating mode during office hours.




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Vijayaraghavan Nair (Managing Director)
Aarsha Chemicals Private Limited
Plot No. 17/27, MIDC Industrial Area,Taloja, District Raigad, Padgha
Raigad - 410206, Maharashtra, India
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