Overview

For the end user, the biggest problem with traditional ducting systems is the maintenance and cleaning which can be very inconvenient and expensive. Tests have proven that insufficiently maintained ventilation systems is the major cause of poor quality indoor air, frequently contributing significantly to sick building syndrome. In the food industry the difficulty in maintaining traditional ducting systems can lead to the provision of the ideal conditions for the rapid growth of micro-organisms which is a hazard to health.

With a KE Fibertec system, maintenance is not a problem since the textile ducts are easily removed and refitted without the use of any special tools. They can be washed and tumble dryed time and time again without the risk of shrinkage. The problem of dirty and unhygienic ducts is now solved once and for all. During operation the KE-Low Impulse System® and KE-Interior System® act as an additional and terminal filter before the air is supplied to the room environment. The degree of this filtration is equivalent to F5 to F6 standards.

We are now able to offer a full repair and maintenance service for our sytems which have been installed throughout the UK. In addition we will maintain and wash previous Euroair systems installed prior to our acquisition of the Euroair distributorship.

For further details of the arrangements we can make for assisting you in your washing requirements, please contact our office for general advice and a no obligation quotation and we will be happy to assist.

Traditional ventilation ducts quickly become dirty over time and are notoriously difficult to clean, which usually results in essential maintenance being overlooked and ignored. To some extent the speed with which traditional ducts become overwhelmed with dust and pollutants depends on a strict regime of filter changing, but neglect of the ventilation system can present a serious threat to public health as well as inefficiency in the system

Pre - Filtration

Textile ducts operate like a filter, absorbing impurities as small as 0.5 µm inside the fabric, thereby ensuring that fresh, filtered air is always distributed throughout the premises. To avoid unnecessary washing, textile ducts should not be the only filter present. Using a pre-filter of at least Class F7 for all outdoor air is always recommended.

The table below shows to what extent pre-filters with different dirt-removing capabilities can reduce the need to wash textile ducts.

Class

Dirt removing capability
( % )

Relative reduction in
washing frequency ( approx )

Pressure drop above
filter ( approx ) Pa

F3
F5
F7
F9

25
45
85
> 95

1.2
1.8
7.0
20

90
120
200
250

As shown above, the washing frequency can be reduced considerably by improving the pre-filtering and changing, for instance, from an F5 to an F7 or F9 filter. The requirements for the fan's performance are also increased, which means that the extra performance must already be factored in at the design phase as there will be no opportunity later on to build in an effective pre-filter without the calculated volume flow falling dramatically.

Washing intervals & proceedure

The intervals for washing and maintaining KE Fibertec's low impulse systems naturally depend on what kind of premises they are being used in, and we recommend different washing intervals according to use.

The table below shows teh recommended washing intervals specified for different uses of KE Fibertec's low impulse systems. Please note the table is simply for guidance, you should contact this office for more specific recommendations regarding individual installations.

Application

Outdoor
Air [ % ]

Pre-filter
class

Approx no of
washes / year

Moulded cheese production etc. The textile ducts are washed when production has stopped to protect against any undesirable micro-organisms.

10

F7

6 - 20

Polluted premises with severe microbiological pollution, e.g. quick chopping room for the processing of spices. The textile ducts can be washed to remove organic material stored inside the ducts.

10

F7

3 - 4

Premises with particular hygiene requirements, e.g. where unpacked meat products are processed.

10

F7

1 - 2

Premises where there are no particular hygiene requirements, e.g. store rooms for packaged products.

10
100
100

F7
F7
F5

0.3 - 1
0.5 - 1
1 - 4

Offices

100
100
100

F9
F7
F5

0.2 -1
0.5 - 1
1 - 4