DX100HTA Single Speed Axial Extract Fan with Timer, Humidistat and Fitting Kit (Formerly DX100H) The Xpelair DX100HTA is a stylishly designed compact single speed extractor fan with a delay timer and an integral adjustable humidity sensor and which is truly easy to install. It is suitable for domestic installations such as bathrooms and shower rooms (including zones 1 and 2) and toilets. It is also suitable for use in commercial environments such as hotel bathrooms, office toilets and other small rooms. Whats the difference between the old DX100H and the new DX100HTA? - The new model has much more advanced humidity sensor which allows for slower increases in humidity without operating the fan (less than 5% RH in 5 minutes). This prevents nuisance triggering of the fan. The entire range have a soft curved flowline grille which will complement any wall or ceiling decor and a compact window installation is ensured by the shallow depth of the outlet spigot. DX100HTA Standard Fan