Selection of System

Having the best possible ventilation duct is of great importance to both workers and machines. A ventilation duct of good quality makes for more fresh air to the workplace, a lower number of injuries, less extensive injuries and requires less power from the fan in comparison with a ventilation duct of poorer quality.


If the ventilation duct is of good quality, a somewhat larger fan should be selected than is necessary. This will make for a lower number of RPMs for the fan and hence significant savings as regards to electricity.


In other words, for a lower total cost a better ventilation system can be obtained which requires less effort in terms of maintenance and which provides more fresh air to the workplace. In addition, you have some spare capacity which can be beneficial to have in the event that any unforeseen events occur.


What is good quality?


The strength originates from the yarn and the weave. Plastic on both sides protects the yarn and the weave against both wear and externally imposed stresses.


A good quality ventilation duct always has:


– stabilised yarn in the weave.


This provides a geometrically stable duct that provides less turbulence.


– a yarn design which allows the threads the possibility to move.


When subjected to loads, this provides a collection of threads that makes it more difficult to tear the textile apart.


– a plastic coating that is thick enough to protect the weave and yarn against both wear and externally imposed stresses.


– a plastic coating which is thick enough to provide good fire protection.


Basically, a knitted weave with stabilised yarn that has stronger weft threads than warp threads and a thick plastic coating provides the strongest and most optimum material for ventilation ducts.


The diameter on the ventilation duct must always be computed to be as large as possible. A duct with a large diameter provides more air than a smaller duct, alternatively it gives the same quantity of air but with significantly lower energy costs.


If you do not have room for as large of a diameter as is needed in order to have good ventilation, it can pay off to select two ventilation ducts with a smaller diameter.


The increased purchase expenses this causes will in turn be saved a number of times over in the form of lower electricity consumption.


High pressure makes for large stresses on the entire ventilation system and costs large sums in terms of energy consumption.


By using ducts with a larger diameter, or alternatively multiple ventilation ducts, you can save large quantities of energy and a great deal of money.


A rule-of-thumb. If you reduce the RPMs of the fan by 20%, you will save approx. 50% in power expenses!


A true breath of fresh air

Jensen Ventilation Flexible Ducting System, we deliver fresh air to all underground operations around the world.