Technical Infomation A Seamless Finish, Integral Astragal, Vision Panels, Flush Cover Cap, and Fully Welded Frame A Seamless FinishPowershield Cleanroom Doors are manufactured from high quality steel. Seamless finishes are applied to all leaf edges to ensure that surfaces can be easily cleaned and that there are no areas where dirt may collect or bacteria can grow. Integral Astragal Overlapping flush atragal are required on Cleanroom double leaf doors when fire resistance is necessary or when air pressure differentials between rooms need to be regulated. Powershield Cleanroom Doors feature a unique, fully-integrated astragal, ensuring no seams or fixings on the face of the door leaf. Vision PanelsCleanroom Doors feature a wide range of cGMP compliant vision panels. Options include 45° vision kits for single glazing or flush glazing to one or both sides. Vision panels can be supplied with no visible fixings to ensure an easy wipe-clean surface. Flush Cover CapPowershield Cleanroom Doors can be finished with a flush cover cap at fixing positions for a smooth easy wipe-clean surface on frames. Fully Welded FramePowershield Cleanroom Door frames are supplied with a mitred, fully welded and ground-smooth connection between jambs and head.