In HVAC Clean Room FIRE DAMPER will be installed in SUPPLY DUCT or in RETURN DUCT?

Both, along with duct smoke detectors in both supply and return ducts.

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Originally Posted by tkrussell

Both, along with duct smoke detectors in both supply and return ducts.

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If we want install FIRE DAMPER choose any one side of supply or return duct?.

Then in which duct fire damper to be installed?.

The clean rooms and data centers I have done, have dampers in both ducts.

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Originally Posted by rajuas100

If we want install FIRE DAMPER choose any one side of supply or return duct ?....

then in which duct fire damper to be installed?...

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If you have to choose one then it is the supply side
The purpose of the FS damper is to prevent smoke and fire to spread, in case there is a smoke or fire in the areas near by (same floor, one floor above/below) the ahu must be automatically stop... if the ducts( SA/ RA) penetrated a fire rated wall it best to put FS damper... but then it up to your local government to tell you where to put the FS damper, but it will need at least one, at the supply side