Eepl Offers A Wide Range Of Dampers Like Multilouvre, Guillotine, Disc Type, Bi-directional, Butterfly Etc. Usually The Drive Is A Motorised Actuator Or Geared Motor Or Pneumatic. For Large Dampers External Double Rack Drive With Single Geared Motor Operation Is Suggested. These Are Very Sturdy In Construction And Ensure Smooth Operation After A Long Period Of In-operation. Butterfly Or Multi Louvre Dampers Ensure A Leak Proofness Of 95 To 98% Whereas Guillotine & Disc Dampers Are Suitable For Higher Leak Proofness (99.5%).