The Whispair Mixed-Flow Fan Kit is a versatile, entry level fan kit with built in speed control.This kit comes with everything you need to get started including fan, airflow matched filter, ducting and ducting clips.Our Whispair fans are quiet and powerful, featuring a two speed switch for greater environmental control and are extremely well built. Whispair Carbon Filters feature Australian RC412 carbon and a really high build quality.Available with Combi Or Aluminium Ducting in the following sizes: 4" Whispair Mixed Flow Ventilation Kit5" Whispair Mixed Flow Ventilation Kit6" Whispair Mixed Flow Ventilation Kit8" Whispair Mixed Flow Ventilation Kit Each Ventilation Kit comes with:x1 Whispair Carbon Filterx1 Whispair Mixed Flow Fanx1 Selected Ductingx2 Duct Clips