destratification fans,destrat fans,destratification fan; destratification fans uk;

Destratification Fans / Industrial Ceiling Fans

Destrat Fans – You cannot beat the laws of physics that warm air rises and this process causes thermal stratification, a natural process which causes warm air to rise to the ceiling or roof space and displaces the cooler air, pushing it downwards into the occupied area. With any conventional air heating system, air will rise to the roof level by natural convection in high building such as factories, warehouses and sports centres. This can result in high temperature gradients and consequently increased energy usage. The Carbon Trust  estimates that the use of destratification fans in industrial buildings with high ceilings can reduce the consumption by up to 20%, although some other studies show that this may figure may be up to 32%. These Destrat Fans are basically a heat recovery unit which benefit from low running costs and little to no maintenance requirement.

Flexiheat UK’s range of destratification fans reverse the natural convection process, re-circulating the warm air back to working levels and provide a permanent reduction in roof space temperature and uniform temperature distribution within the building , via thermal destratificationdestratification fans,destrat fans,industrial destratification fans,industrial ceiling fans.destratification fans uk

The Benefits Of Destratification Fans / Industrial Ceiling Fans –

  • Increased energy efficiency
  • Lower energy costs
  • Improved comfort for the workforce
  • Potentially fewer heaters required
  • Can be used for cooling effect in the summer

The most commonly used destratification fans are;-

Low velocity – blade or propeller fan ( also known as Punkah fans) – These work by churning the air and are most appropriate for ceiling heights between 3 metres  and 10 metres  (pictured above)

High velocity axial fan – These send a significant amount of air at high speed towards the floor and are best for heights of 10 metres  to 20 metres (pictured below)


destratification fans,destrat fans,destratification fan; destratification fans uk;

Destratification Fans / Destrat Fans from Flexiheat UK

We do both versions of these destratification fans at Flexiheat UK

Design considerations for Destratification Fan / Industrial Ceiling Fans systems –

1. Safety First – Ceiling fans have to placed so that there is a minimum distance of 2.3 metres between the floor and the bottom edge of the fan blades

2. Most suitable type of fan for the application – See above with regards to mounting heights of the two different fans

3. Positioning of the unis for optimum air distribution

4. Noise levels – DBA of the units

5. Number of units required

6. Mounting height of the fans to prevent any draughtsDestratification fans

Control options for destratification or destrat fans

These units can be controlled via a thermostat and there are various control options available –

1.Fan operation is linked to the air temperature at the ceiling height

2.Fans only come on when the heating system is on

3.Speed control of the fans to prevent draughts

4.Fans are controlled independently of the heating system

5.Summer Function for cooling effect

How to Size Destratification Fans / Industrial Ceiling Fans

For the low velocity destratification fans – you size like this –

Which low velocity destratification fan model do I require and how many do I need ? the fan selection depends upon the height and area of the building.

Mounting heights –

FHCF900 (900mm diameter fan) units for a maximum of 3m mounting height
FHCF1200 (1,200mm diameter fan) units for a maximum of 6m mounting height
FHCF1400 (1,400mm diameter fan) units for a maximum of 9m mounting height

*Please note the ‘mounting height` refers to the distance between the blades and the floor. There must be a minimum distance of 2.3m between the floor and the lowest point of the fan.

Area covered per destratification fan

FHCF900  -1 per 33m²

FHCF1200 -1 per 90m²

FHCF1400 -1 per 145m²

For this guide we will be calculating in metres

1.Calculate the internal height
2.Calculate the length by the width to get the square meters of the internal space
3.Choose the most suitable fan based on the maximum height it can do
4.Divide the square meters of the internal space by the square meters that the chosen fan model can do. This will then give you the number of fans required. See below example

For an internal area of 20m in length, 20m in width and 4m in height, the calculation would be as follows;

20 x 20 = 400m². The height is 4m so the most suitable fan would be the FHCF1200 as it has a maximum height of 6m. This fan has a coverage of 90m², so the next sum would be 400 ÷ 90 = 4.4
As this resulting figure is over 4, you would require 5 fans for this area.


For the high velocity destratification fans – you size these like this –

Consider the mounting height first as this will dictate which type of destratification fan you require. Then calculate the volume of the building and multiply by two to determine the amount of air that needs to be re-circulated for effective destratification. Divide by the primary air flow of the unit to determine the number of units required.


                      Before                                                             After


destratification fans,destratification fans in churches,destrat fans
destrat fans, destratification fans,industrial ceiling fans,destratification fans uk


Without  destratification / Destrat fans installed

As you can see in the above before picture,  the ceiling is hot and the floor area is cold due to the warm air rising. To get the required temperature at floor level you have to heat up repeatedly, even though the ceiling area is already 26°C.  The high temperature of the ceiling causes a corresponding high energy loss at the ceiling.  Often some areas of the room stay cold after prolonged heating.

With destratification / Destrat fans installed

Our industrial ceiling fans equalise the room temperature by pushing down and mixing the warm air. As you can see in the  above after picture, this results in a  5°C higher temperature at the floor without any additional heating, meaning a  30% fuel saving.  If we have an outside temperature of 0°C and you can  reduce the temperature from 31°C to 21°C at the ceiling, the energy usage is reduced by 32%.  This results in a much even temperature throughout the building with no cold spots


Product Information on the Low Velocity Destratification Fans

low velocity destratification fans; destrat fans; destratification fan;

Product Features and Benefits  –

  • Easy to install and maintain
  • Long life ball bearings and silent automatic shutters
  • Safety cable included
  • Single phase 220V to 240V 50Hz
  • Ceiling mounted air circulation fan

Destrat Fans / Industrial Ceiling Fans accessories –

FHFC1.7  – Electronic Controller (up to 5 fans)

FHFC3.0 – Electronic Controller (up to 9 fans)

FHCFC1.7 – Reversible Electronic Controller (up to 5 fans)

FHCFDC – Automatic Ceiling Controller     

These low velocity destratification fans are supplied with 2 downrod lengths- A  400mm downrod fitted giving a 610mm overall drop (from ceiling to base of motor body) and a 150mm downrod (supplied loose) giving a 360mm overall drop  (from ceiling to base of motor body)   ***  we highly recommend using the 400mm downrod.

Destratification Fans from Flexiheat UK; destrat fans; destratification fan; stratification fans;

FHCF1200 Dimensions- 360mm overall drop (minimum) or 610mm overall drop (maximum)

**Ideally the fan  should be mounted above the lighting system and with a clearance of at least 610mm between the blades and the roof

Download the Low Velocity Destratification Ceiling Fans – FHCF Brochure Flexiheat UK

Product Information on the High Velocity Destratification Fans / Industrial Ceiling Fans


Model FH03291 

The ideal destratification solution for buildings with a maximum ceiling height of 16m.  The fan unit is fully enclosed in a protective casing making it particular suitable in areas such as sports halls

Comes complete with a suspension kit  including chains and ceiling hooks destratification fan, industrial ceiling fans,desrat fans uk,stratification fans


Model FH03310 and FH3312

These destrat fan units are  IP54 Splash-water proof  and dust proof protected

These are surprisingly quiet and low energy consumption units

Comes complete with a suspension kit  including chains and ceiling hooks


The FH03310  industrial ceiling fans are designed for a maximum ceiling height of 14m

The FH03312 industrial ceiling fans are designed for a maximum ceiling height of 20m


Technical Data for our Industrial Ceiling Fans / Destratification Fans 

Voltage230 V, 50 Hz220 V, 50 Hz220-240V, 50 Hz
Power260 W265 W350 W
Max. Current1.1 A1.2 A1.6 A
Speed (rpm)1,2601,3501,350
Air Volume18,000 m3/h13,600 m3/h21,300 m3/h
Performance16 m14 m20 m
Sound level at 1m65 dB(A)71 dB(A)64 dB(A)
Weight12 kg10.2 kg17.9 kg
Diameter81 cm69 cm83.5 cm
Height34 cm20 cm25.5 cm
IP protectionIP2xIP54IP54
Test markCECECE
Packaging83 x 83 x 40 cm76 x 70 x 23 cm76 x 70 x 23cm
Subject to change.

Download Brochure for Industrial Ceiling Fans

Destratification Fans –  Destrat Fans – Industrial Ceiling Fans for Sale UK & Ireland  

We have a great range of destrat fans to suit all commercial and industrial destratification needs, all are the best quality , and at the best prices. These destrat fans will automatically recirculate the high level warm or hot air from high level , to ground level, thus reducing stratification and any associated heat losses.This movement of the warm air from the ceiling or roof, down to the floor level, not only converts potentially wasted heat or energy back into useful heat, but can also lead to reduced energy bills, as they can save up to 32% depending on the height of the building, warehouse, factory or church .If you require any further assistance with any of our Destratification FansDestrat FanIndustrial Ceiling Fans, please click here to contact us via email or call us direct on 01202 822221.