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.

Features

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.