![]() **** Information is to the best of our knowledge and we reserve the right to change specification without notification. Information is offered in good faith but cannot be used in place of current test evidence. ** All information given is for guidance purposes only. * Due to the technical nature of our products they are designed to be installed by a professional. Note: This product requires the NOR-COUSTIC mastic to fit it. ![]() ![]() Huge collection, amazing choice, 100+ million high quality, affordable RF and RM images. TechnicalĬolour: Polished Chrome, Satin Chrome, Gold Find the perfect door letterbox stock photo. Please refer to our technical department for test evidence. UPVC doors are different in that the uPVC letterbox is a complete box that includes a telescopic sleeve. All technical information is given as guidance only. NOTE: Screen colour may differ from actual product colour. They’re one of those rare items that are so well designed, and do their job so well, that we take them for granted. Previously this may have caused significant damage to the soundproofing of the door set but the NOR400 aims to protect its acoustic properties.Īvailable in Gold as well as satin and polished chrome, this high quality letter plate is the perfect solution for those wanting to not only secure a fire door but who are also concerned with keeping unwanted sound to a minimum. Fitting a Letterbox In an External Door Most of us rarely even think about the existence of letterboxes. The NOR400 has been specifically made to rectify the problem of unwanted sound being transferred in doors where cutting a hole in the centre of the door for a letter plate is a necessity. Norsound’s NOR400 acoustic letter plate comes acoustically tested up to 40db whilst also being fire- and smoke-tested to up to 60 minutes integrity.
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