Change/Replacement of Prefilter and Bag Filter


Objective: To establish a standard procedure for changing the pre filters and bag filters of HVAC System

Scope: This procedure is applicable for replacement of pre filters and bag filters of HVAC System of (Company Name)

Responsibility:
1. Operator shall be responsible to follow the procedure strictly.
2. Supervisor shall be responsible to ensure that the SOP is followed properly.

Accountability: Head of Engineering

Precautions:
=>> Concerned personnel should be trained on the SOP
=>> PPE should be worn before starting work.
=>> Hang the instruction board “UNDER MAINTENANCE”.
=>> Isolate the power of the AHU

Procedure:
Following works shall be done sequentially to change the filter
=>> Criteria for filter change:
=>> Pre filter: physically found damage, un-cleanable or after one year.
=>> Bag filter: physically found damage or differential pressure exceeds 200 Pascal (20 mm of H2O)

=>> Removing procedure
=>> Open the door of the AHU
=>> Unscrew the filter from housing / frame
=>> Remove the filter from housing
=>> Carry out the filter to the rejected filter area.

=>> Installation procedure
=>> Clean the filter housing
=>> Select the filter as per specification
=>> Give the allotted code number to the filter
=>> Set the filter to the filter housing. Ensure the air flow direction before fixing the filter.
=>> Ensure that the filter is fixed with sealing gaskets
=>> Use sealant if required to avoid infiltration of air
=>> Close the door of the filter properly

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