【UPGRADED】 97011790 Grille Compatible with Nutone Broan Wall Fans 509s，509S-A, B Wall Fans Kits，OEM SIZE and Color，Knob Threads and Screws Have Been Strengthened.The Service life is Longer Than before

【UPGRADE】Compared with the 97011790 grille wall fan kits from other manufacturers, we have upgraded the materials of components such as the built-in threads of screws and knobs. We have replaced the easily damaged plastic threads and iron screws with those made of pure copper and stainless steel. In addition, with the adoption of modern hardening and heat treatment processes, the service life of our product is far longer than that of the original product, and it also has a better texture The grille size is：11 1/2 inch x 11 1/2 inch，OEM size and color，THERE ARE HOLES ADAPTED FOR THE SPEED CONTROL KNOB，Please confirm your model and size before purchasing. The grille looks similar, but the size or model is different 97011790 Grille (Replaces Old Style) Compatible Models:509S Ventilation Fan，509S-A Through Wall Fan - 180 Cfm / 6.5 Sones，509S-B Through Wall Fan - 180 Cfm / 6.5 Sones，509SMG ，503，505，507，509S (replacement old style) PLEASE NOTE that there is A SMALL HOLE at the top right of this grille for installing the control knob, so if your current grille does not have such a small hole, it may not be suitable. Before purchasing, be sure to remove the old grille and measure its dimensions to avoid any mismatches. If you have any questions, please contact us promptly via Amazon, and we will reply to you as soon as possible. We have treated the surface of the exhaust fan cover to make it more textured and easy to clean!