SOP for Cleaning of Return Air Risers Filter

What is a return air riser?

More precisely known as a Return Air Riser, which is used to collect the return air in a specific manner to maintain a perfect laminar flow. Return air is 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 / Executives shall be responsible for following the procedure mentioned in this SOP.

Accountability

The production Head and QA Head shall be accountable for the compliance of SOP.

Procedure

• All the cleaning and sanitization activities shall be done after the completion of the 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 is found inform immediate to Production officer or Engineer to change the filter.

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• After drying wrap the individual filters 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 the respective area.
• Fix The Replaced Set of Pre-Filter in the Respective grill.
• The frequency of Filter cleaning shall be once in a month and at the time of product changeover.
• 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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