Deluxe quick fit wall kit, which can be installed entirely from the interior of a property, helping to save time, money and energy. The kit includes an adjustable wall liner, white external grille and rubber seal. his versatile kit can be easily adjusted to suit the thickness of the wall, ranging from 225mm to 390mm. designed to protect against water ingress and can also be used as a passive air inlet grille. Includes backdraught shutter- Mounted through wall- Passive vent- Adjustable from 225mm to 390mm- Can be used with any 100mm fan- Includes backdraught shutter- The external rubber seal covers up any break-out on the external hole and leaves a clean, tidy finish. In addition, the rubber seal will help to protect against water ingress.