We were asked to work with a regular client to provide six units to replace the existing aged swimming pool extract AHU’s. The brief was to ensure each unit matched the existing duct and coil connections so that minimal on site modifications were required. A full inspection of the existing main supply unit was carried out to ensure suitability between the supply and extract run around coil systems. Each unit was a special vertical upward model comprising of filtration, direct drive fan, run around coil and outlet cowl. All components and surfaces were protected against a chlorinated atmosphere.