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Dear Roland Whilst looking back through archived e-mails on the above topic I came across your neat all-in-one solution to the problem of internal reflection, differing wavelengths and infection control. We have in the past tried something similar using hardboard (not strictly fireproof) incorporating the laser sign. My question is: Were these metal flaps commercially available or were they all made to suit the windows in question? It is all a question of a quick solution to new theatre doors about which we were not originally consulted. Opaque film has been suggested but I am sure that will only work for certain wavelengths and is likely to peel off apart from being in place permanently and nullifying the idea of a vision panel. I have no data on such material. I would be very grateful for your comments. Mike Edwards LPA Medical Physics Dept. Derbyshire Royal Infirmary Derby ` e-mail: [log in to unmask] DE1 2QY Tel: 01332 347141 ext.4579 >>> Roland Blackwell <[log in to unmask]> 17/04/2002 14:33:04 >>> For what it is worth; in some of the theatres I inspect use has been made of a fold up, matt enameled surface, metal screen to cover the glass. The screen carries the laser warning sign and is securely fixed in the closed position when the laser is in use. The screen is easily cleanable and can be decontaminated acceptably from the microbiological standpoint. Roland Roland Blackwell (9207) ********************************DISCLAIMER******************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. However, any views or options presented are solely those of the author and do not necessarily represent those of the Derby Hospitals NHS Foundation Trust. If you are not the intended recipient or the person responsible for delivering the email to the intended recipient, be advised that you have received the email in error and that any use, dissemination, forwarding, printing or copying of this email is strictly prohibited. Derby Hospitals NHS Foundation Trust will not be liable for direct, special, indirect or consequential damages arising from alterations of the contents of this message" by a third party or as a result of any virus being passed on. If you have received this email in error please contact the Derby Hospitals NHS Foundation Trust administrator. Email or telephone on 44 (0)1332 340131 ext 5777 or [log in to unmask] **************************************************************************