Supply, installation, testing and commissioning of OT plenum with HEPA Filter made out of Stainless Steel in construction complete with Floor operated Bewel Gear Damper, Filter fixing Arrangement along with DOP test port. Filter fixing frames as standard. Modules to include SS 304 1.2mm thick perforated grille with SS CSK Screw to fit flush with Module. It should be complete as per Technical Specifications and as per directions of engineer-in- charge.Plenum size 2400mm x 1800mm. HEPA filter size 600 x 600 x 300mm (99.97% efficiency down to 0.3micron)