Ltpgtcentrif duo plus is designed to provide extraction levels that comply with building regulation document f requirements with special humidity sensing variants for local authority use the centrif duo plus is for kitchens and utility rooms and large bathrooms surface mounting directly into standard 100mm diameter ducting through the wall or ceiling installationltpgtltpgtthe centrif duo plus has a 100mm circular spigot the flush mounting kit enables the spigot to be convert