| | | I Applications/use For medium airflow volumes against high resistances. Specially designed to be installed in circular ducting. Minimum height for tight spaces like ceiling voids in commercial and industrial applications. I Features The SquareLine centrifugal in-line fan range offers an excelent performance in nominal diameters 100 mm-315 mm. Compact design to minimise space and cost. Key hole fixing points offer fast and effective installation. Quick fixing plate supplied with the unit assist in faster installation. 100% speed controllable. Matching range of silencers to suit offering the same space saving height as the fans. Extensive range of accessories including speed controllers, pipe clamps, anti vibration mountings. Twin fan applications can be met with two fans in series clamped together offering 100% standby. Units can be mounted for top or bottom access. | | Simple electrical connection via a choice of knockouts in the casing. Robust corrosion resistant casing with spigots for duct connection. ■ Specification ■ Fans All units are fitted with a backward curved centrifugal impeller powered by a direct driven motor. ■ Motor All motors are fitted with maintenance free, sealed for life ball bearings. Protection to IP 44 with class F windings. ■ Motor protection All models are fitted with automatically resetting thermal contacts wired in series with the motor windings. ■ Casing Standard units of galvanised sheet steel with access panel & spigot connections. Knockouts for electrical connection and fixing holes are provided in the casing. | | |
| | | ■ Impeller All units are fitted with backward curved centrifugal impellers of either galvanised steel or plastic. ■ Speed control All models are fully speed controllable. Suitable controllers are available as accessories. ■ Electrical connection The connection of the electrical supply must be carried out in accordance with all relevant regulations. ■ Installation Installation at any angle. ■ Safety notice A protection against accidential contact to DIN EN 294 must be provided by the installer. ■ Noise levels The technical data table shows the sound pressure level (air noise) in dB(A) at 1 metre under freefield conditions. Installation conditions and/or obstructed airflow into the unit may lead to substantial increase in noise levels. | | ■ Performances All performances are related to an air density of 1.20 kg/m3. ■ Twin Fan arrangement By connecting two squareline fans of the same model together in series an effective compact twin fan design can be achieved. Two units can easily be connected together using the standard Helios pipe clamps type BM (available as an accessory). ■ Twin fan performance There is a loss in performance using these fans connected in series as a twin fan application the actual performance is shown on the page opposite. ■ Twin fan operation To acheive an effictive run and stand by combination the twin fan set should be controlled with an auto changeover panel ACOP 1 or ACSW 1 (available as an ancillary, see page 290). | | |