What is a return air riser?
More precisely known as Return Air Riser, which are used to collect the return air in a specific manner to maintain a perfect laminar flow. Return air are manufactured in the factory as per the design requirement. They are constructed in GI/SS or anodized aluminum and then powder coated for better aesthetic looks.
Objective
To lay down a procedure for cleaning of return air riser filters.
Scope
This SOP is applicable for cleaning of return air riser filters.
Responsibility
Production Officers / Executive shall be responsible for follow the procedure mention in this SOP.
Accountability
Production Head and QA Head shall be accountable for the compliance of SOP.
Procedure
- All the cleaning and sanitization activity shall be done after the completion of day’s work.
- Remove one filter at a time from the polybags.
- Wash the pre-filter with purified water from the downstream side of the filter.
- Repeat washing 3-4 times till there are no remnants of the product in pre-filters.
- visually inspect that there are no remnants of the product.
- Dry the pre-filters using filtered compressed air.
- Check the filters for any damage, if damage found inform immediately to Production officer or Engineer to change the filter.
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- After drying wrap individual filter in fresh poly bags.
- Sanitize the outer surface of poly bags.
- Mop the grills of the pre-filters & inside the ducts, by alternative wet and dry mopping using 70% IPA solution.
- Transfer the cleaned filters to respective area.
- Fix The Replaced Set of Pre-Filter in the Respective grill.
- Frequency of Filter cleaning shall be once in a month and at the time of product change over.
- Enter the cleaning record of pre-filters of return air raisers in return air raiser cleaning record as per Annexure-1.
Annexure
Annexure – 1: Return Air Raiser Cleaning Record
Abbreviations
SOP : Standard Operating Procedure.
Revision History
Nil
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