have installed the ventilation grille in my pantry and I must say looks very good and the Funtkion the knob to open the vents is very well done. Easy installation with four screws, which unfortunately are not present in the delivery, but four screws has almost every home improvement in the toolbox. It is a little tighter price but I would buy the ventilation grille, since the quality of the grid is very good and is very stable. Therefore from me 5 stars and a buy recommendation .....