There are brands like Led Lum that understand your needs. Its range of fans will adapt to the needs of any home. They have shutter fans and axial fans. The shutter fan is wall mounted with a vent on the back. Unlike axial fans, these are larger in size, so they can be used in kitchens or bathrooms. Exhaust fans are available in three sizes, 150mm, 200mm and 250mm. On the other hand, there are axial fans with or without vents on the back. It is available in two sizes of 100 mm and 150 mm.