At Sill Line we have invested considerable time effort and engineering design into our trench heating grille. Where other manufacturers choose to save costs and provide an inferior product we have stuck with our design which we believe to be far superior. To see for yourself take a look at the picture below. One grille has been produced in our factory in Daventry, UK, the other came from the far east. Sill Line grilles are made from solid aluminium anodised to AA15 shown here in natural satin finish. The blades are crimped onto a solid nylon rods to SAM 66. There are a wide range of colours available for customers who would prefer something a little different. Grilles are also available in a variety of solid woods.