Exhaust fans are a very important part of any household. But a main problem with exhaust fan is it gets very dirty over a period of time. The exhaust fans of your kitchens and the fans of your bathrooms go through hell, dispelling all the smoke and odour. They collect massive amounts of dirt and if they are not periodically cleaned they will slow down or even at some points break down. You can buy exhaust fan in tandem but if you do not clean them periodically, they will break down and leave your household a giant chamber of bad odour.