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DSU3 Destratification Units

DSU2 Destratification Unit
  • The DSU3 Destratification Unit reduces heating bills by up to 30% in industrial buildings with ceiling heights in excess of 4m
  • Applications include warehouses, workshops and exhibition halls
  • Recycling warm air that has collected at high level, the DSU3 range is effective for ceiling heights from 4m to 15m
  • A built-in thermostat means the Destratification Unit operates completely automatically

Range & Prices

The prices shown are list prices and perfectly safe to use for budget purposes. Contact your electrical wholesaler for final prices.

Model Area Covered Recommended for
Roof Heights
List Price
DSU3-40  18m x 18m 4m to 7m £897.00
DSU3-45  20m x 20m 7m to 10m £949.00
DSU3-50  25m x 25m 10m to 15m £1130.00
DSU-4 installed in a vehicle repair shop in Kent

Destratification units save up to 30% off an annual heating bill

Optional Controller (Suitable for DSU3-40 and DSU3-50 only)

A DSU-2R is especially useful when noise/draught are an important consideration. One controller is required per unit.

Model Description List Price
DSU-2R Fan Speed Regulator (one per DSU3-40 or DSU3-50) £170.00
DSU-R Fan Speed Regulator

DSU-2R Fan Speed Regulator

How It Works

The DSU3 destratification unit is not a heater.  It is a simple device specifically designed to ensure that the heat produced by fan heaters is not wasted.  Correctly selected and installed, a DSU3 Destratification Unit can reduce energy use and thus heating bills by 30%.

Fan heaters give rise to a very significant temperature gradient.  Typically air temperature will increase by 2.5⁰C for every metre above floor level.  This means that 5m high building when the temperature at floor level is 20⁰C, the temperature at high level will be 32.5⁰C.  This high temperature is expensive to generate and serves no useful purpose.

The DSU3 destratification unit will prevent this expensive waste of energy.  The unit’s built-in thermostat should be set at a temperature approximately 3⁰C higher than the required air temperature.  As soon as the thermostat set-point is reached the high powered fan will be automatically switched on.  The fan will scavenge warm air that has collected under the roof and return it to low level where it will contribute to the space heating requirement.

Technical Specification

Model Volts Amps Ingress Protection Airflow (m3/h) Fan motor (W) Roof height (m) Area covered (m) db*@ 5m Weight (kg) Dimensions (mm)
DSU3-40 230 0.8 IP20 3800 180 4-7 18 x 18 62 18 300 600 600
DSU3-45 230 1.0 IP20 5600 240 7-10 20 x 20 64 20 300 600 600
DSU3-50 230 1.7 IP20 7650 380 10-15 25 x 25 65 22 300 600 600
*Noise levels are factory tested, not laboratory tested
Mounting – All models are to be suspended on the chains/hooks provided.
Control – All models are switched via their built-in mechanical thermostat. See DSU-2R fan speed regulator below for added control.




Fan speed regulator (Not suitable for DSU3-45)

Voltage supply:


Maximum load:

2.5A (one regulator per DSU3)


30% to 100%


124mm x 124mm x 95mm (including knob)

Special feature:

Click to off



If you would like the experts at BN Thermic to select a suitable heating for your application, please click here to access our enquiry form.  Simply provide as much information as you have available and we will respond with a detailed proposal.

Enquiry Form

Use the following selection guide

DSU3 destratification units should be used when:

  1.  A building is heated by fan heaters
  2. The roof height is between 4m and 15m

In these circumstances one or more destratification unit should be suspended at high level.  The use of Equaliser Destratification Devices will reduce energy consumption by up to 30%.

There are two steps in the selection process:

Step One – select DSU3 model

The correct equaliser model is determined purely by the height of the roof

Roof Height    Model
4m to 7m DSU3-40
7m to 10m DSU3-45
10m to 15m DSU3-50

Step Two – quantity and distribution

The following table shows the area covered by DSU3 destratification units.  The objective is to cover the entire roof area.  Often only one DSU3 destratification unit is required but in larger buildings a number of devices should be evenly distributed.

Model  Area Covered
DSU3-40 18m x 18m
DSU3-45 20m x 20m
DSU3-50 25m x 25m

Without DSU3
Warm air accumulates at high level


With DSU3
Warm air is recycled reducing
heating costs by up to 30%