An air curtain comprising - a longitudinally extending air inlet section , - a longitudinally extending air outlet section , said longitudinally extending air outlet section comprising an array of tubular channels , said array - having an upstream first side for air from the longitudinally extending air inlet section , and - a downstream second side for the discharge of air from the air curtain , - a row of electrical fans for moving air from the longitudinally extending air inlet section to the longitudinally extending air outlet section , and - means for guiding air from the row of electrical fans to the first side of the array , said means comprising wall members defining a flow path for air from the air inlet section to the air outlet section ; characterized in that the upstream first side of the array of tubular channels is facing and at an angle a between 20° and 70° to the flow path of air feeding said array of tubular channels , and the air curtain comprises a plurality of longitudinally extending baffles for guiding air from the fans to the array , said baffles defining together with wall members of the air curtain wide channels for air from the fans to the first side of the array , wherein - the fan blades rotate in a plane, with the axes of rotation being perpendicular to said plane, - the baffles are with their leading edges at a distance - measured parallel with the axis of rotation of the fans - of less than 1/3rd of the diameter D of the fan as defined by its blades to the blades of the fan, the location of the leading edges of the baffles being chosen such that projected on the plane, wide input areas are defined that each cover a section of the effective surface areas of the fan blades , - the baffles comprise trailing edges , wherein said trailing edges are at a distance of less than 5 cm from the first face of the array of tubular channels . - a longitudinally extending air inlet section , - a longitudinally extending air outlet section , said longitudinally extending air outlet section comprising an array of tubular channels , said array - having an upstream first side for air from the longitudinally extending air inlet section , and - a downstream second side for the discharge of air from the air curtain , - having an upstream first side for air from the longitudinally extending air inlet section , and - a downstream second side for the discharge of air from the air curtain , - a row of electrical fans for moving air from the longitudinally extending air inlet section to the longitudinally extending air outlet section , and - means for guiding air from the row of electrical fans to the first side of the array , said means comprising wall members defining a flow path for air from the air inlet section to the air outlet section ; - the fan blades rotate in a plane, with the axes of rotation being perpendicular to said plane, - the baffles are with their leading edges at a distance - measured parallel with the axis of rotation of the fans - of less than 1/3rd of the diameter D of the fan as defined by its blades to the blades of the fan, the location of the leading edges of the baffles being chosen such that projected on the plane, wide input areas are defined that each cover a section of the effective surface areas of the fan blades , - the baffles comprise trailing edges , wherein said trailing edges are at a distance of less than 5 cm from the first face of the array of tubular channels . <EOS>