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Alpha Industrial Series - Downflow Discharge Axial Fans

Alpha Industrial Series - Downflow Discharge Axial Fans


The Alpha & Beta Industrial Series of axial roof units are designed for a wide range of free intake and ducted applications. These durable and robust units feature adjustable pitch impellers which allows for optimum air flow and power efficiency.
There are 6 sizes in each range extending from 500 to 1000mm diameter.
Typical Application
General supply air or exhaust air including a range of toxic, noxious and corrosive gases from a wide range of commercial and industrial applications.

Smoke-spill Applications
The Beta Industrial RSSL Series of smoke-spill fans has been fully tested to meet the air performance and high temperature test requirements of Standards AS/NZS1668.1:1998 and AS4429:1999.

Discharge damper fail-open latching
An additional requirement of AS/NZS1668.1:1998 with respect to un-sprinklered buildings (300°C for 30mins) requires dampers to fail-open during smoke spill operation.
The fail-open discharge damper latches come in two forms; the first being a manual release type requiring manual closing after the fan has been run. The second design, an electro-mechanical type permits the shutter latch to release and close automatically after the fan stops.
For advice on smoke-spill wiring requirements refer to AS/NZS1668.1:1998.
  • Wide choice of speeds available.
  • Adjustable pitch impellers provide a wide range of performances.
  • Impeller blades can be GRP, aluminium, nylon or anti-static to suit the application. GRP blades are standard.
  • Shutters are standard on the RVLE range and an optional extra on the RDLE units. (See Special Note).
  • Can be used for free intake or ducted systems.
  • Can be mounted at angles up to 30°.
  • All standard motors are speed-controllable using variable speed drives.
  • Multi-speed motors as well as motors to meet Ex d, Ex e, Ex nA or Ex tD Standards can be supplied.
  • For applications prone to high prevailing winds refer to Special Note.
  • Elta Group