Roof mounted twinfan unit for external use, with a high efficiency forward curved centrifugal impeller, sensors fitted in each scroll monitor air flow, detect and signal flow failure. Direct drive motors fitted with thermal protection and manufactured to BS5000. Class B insulation and sealed for life bearings. Air is discharged into a common outlet plenum chamber through separate shutter system which prevents blow back through the standby fan. Unit casing is manufactured from Aluzinc, the underside of the cover which encloses the inlet chamber is acoustically lined.
Fans are suitable for operation in ambient temperatures up to 60°C. All units are suitable for internal and external use and may be installed up to a maximum angle of 5°. (Care must be taken to ensure the back draught dampers operate correctly).
Note: fan sizes 1 - 15 are supplied with controls. Fan sizes 16-24 are not supplied with controls - refer to I&M manual.