Egevemt EKFP sand retention louvre model is used to retain sand on the outside of the duct when sucking in and blowing out at a certain speed. It can be made of aluminium louvres and a sand retention unit made of galvanised sheet metal or stainless steel. Can be painted with electrostatic powder paint on request. Standard colours are RAL 9010 and 9016. Other colours are available with stove paint.