System 25 is specifically designed for concealed installation between the concrete slab and the plasterboard ceiling of the dwelling below. Fire shutters are not normally necessary when the ducting system is contained within one fire compartment. Where System 25 passes through a fire wall, special System 25 duct closers are available.

System 25 offers many advantages over traditional sheet metal flat ducting being less than half the weight, non-corrodible, non-reverberant and easy to cut with a conventional saw. The range includes all the bends, adaptors, plenums and accessories necessary for a complete installation. When using Solo fans with System 25 flat ducting remove the shutter flap and cut off the 100mm spigot flush with the rear of the Solo fan.