New acoustic extract fan range

摘要

Dunham-Bush has introduced a range of acoustic extract fans. Available in single and twin fan configurations these compact units can be specified for indoor or roof top applications. The three series of units, eDF, eTF, and eRTF offer quiet, high quality and energy efficient extract fans to suit most commercial applications. Unit sizes with air volume flow rates from 50l/s to 950l/s for single fan units, twin fan auto change over and roof top units are available from the standard range. All units are equipped with automatic or manual speed control and local electrical isolation switch. The eDF model is an inline ducted single fan arrangement to suit small commercial applications where the occupant requires manual control over air flow. The ECO-SPEED controller enables manual variable local speed control and an off position. The eTF model is an inline ducted twin fan arrangement making it suitable for applications where continuous operation is vital. The ECO-TF controller on this model enables duty share and auto change over together with a speed controller allowing for trickle and boost options with speed adjustment. It can be enabled/ disabled from a BMS/VFC time-switch and has a fault output signal capability. The eRTF model is a compact twin roof fan utilising the same controller as the eDF model with all the same control functions. The eRTF fans are available with either bottom square and/or rear circular spigot inlets, and are manufactured from high quality powder coated sheet steel.