Duct connector allows attachment to circular ducting to the Ecor Pro DSR12 or DSR20 industrial dehumidifiers. Included with the kit are:- 1, New DSR reticulated foam filter 2, Front ducting assembly with flange 315mm diameter 3, Rear pre-drilled flange 315mm diameter Fits in seconds as it replaces the existing filter frame that comes with the DSR12 or DSR20. Square ducting is of course possible without this duct kit on both the DSR12 & DSR20 industrial dehumidifiers. However, for circular ducting attachment this ducting kit is essential to create an easy and quick coupling. The rear fitting flange is pre drilled to marry easily against the DSR industrial dehumidifier. The inlet duct coupling fits into the exiting filter frame with its own filter housing allowing still for air filtration while circular duct coupled. The existing filter holder that comes with the DSR industrial dehumidifier is not used with this duct adaptor. Both coupling & rear flange can be fitted in less than 1 minute allowing fast installation time into the existing circular ducting.