Follow
Objective: To establish a standard procedure for replacement of HEPA filters
Scope: This procedure is applicable for replacement of HEPA filters at HVAC system, (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
=>> Before changing filter record the pressure drop in ANNEXURE-I
Procedure:
Following works shall be done sequentially to change the filter
=>> Criteria for filter Replaced:
=>> HEPA filters will be replaced due to Integrity test failure.
=>> When pressure drop exceed 450 Pa
=>> If it is found physically damaged
=>> Removing procedure
=>> Open the door of the HEPA box (Incase of plenum)
=>> Unscrew the filter from housing / frame (Incase of plenum)
=>> Unscrew the filter frame from housing (Incase of terminal)
=>> Remove the silicon by anti cuter (Incase of terminal)
=>> Remove the filter from housing
=>> Carry out the filter to the rejected filter area / scrap yard
=>> 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
=>> Properly tighten the all screw / bolts.
=>> Close the door of the filter properly
=>> Switch ON of the AHU
=>> Observe the pressure drop & air flow and record in annexure-I
=>> Carry out the integrity test.
