When a door is fitted a gap is left between the door itself and the frame to allow the door to open and close. As essential as this gap is, it can be a path for noise, smoke and dust. With the Norsound 700 range of acoustic perimeter seals you can find one that best suits your needs - for any application. Browse our selection of perimeter seals - we offer both surface mounted and rout-in versions to suit your requirements and all can be fitted around the head and jambs of the doorset. Our perimeter seals make innovative use of our tried and tested 'dual air pocket' technology helping to reduce transmitted noise and increase efficiency.