Insect Proof Screening
Insect Proof Screening

Insect Proof Screening

Cadisch was established in 1883 and has become the UK’s leading supplier of precision meshes for a multitude of different applications. Our range of flyscreening is used throughout the world and is used in many different ways in order to control the passage of all forms of insect and reptile life – as well as enabling companies and individuals to comply with increasingly stringent controls on health and safety, food hygiene and environmental regulations.

We offer here a selection of the most popular materials, together with their technical specifications.
A mosquito net acts like a shield from mosquitoes, flies and all other insects and offers protection from all the diseases that they carry. Mosquitoes can be the carriers of diseases such as malaria, yellow fever, dengue fever and numerous forms of encephalitis such as the West Nile virus. In order to provide effective protection, mosquito net mesh has to fine enough to keep these insects at bay. They have to be a barrier without obstructing the flow of air or visibility (to an acceptable degree). Treating a mosquito net with an appropriate mosquito repellent or an insecticide can greatly increase its effectiveness.

History Of Fly Screens

Though the actual term “mosquito net” was coined only around the mid-18th century, the use of these nets themselves date back to prehistoric times. The Egyptian queen Cleopatra is said to have slept under a mosquito net and they were used during the construction of the Suez Canal when malaria plagued the area.

Fly Screens may be made of materials such as cotton, polyethylene, polypropylene, polyester or nylon. A 1.2 mm mesh size is sufficient to keep mosquitoes away while one with a 0.6 mm mesh size will stop other insects such as midges which also tend to bite.

Types Of Fly Screens

Depending on the area and the location that it is going to be used in, a mosquito net will be structured differently:

• Frame-hung mosquito netting is ideal for four poster beds or any bed that has a frame around it. These provide a rectangular space on the bed and the chances of a mosquito coming in direct contact with the skin are minimal.

• Ceiling hung nets are used where the bed has no frame and they may be hung from a ring that suspends from the ceiling, right above the bed.

• Fly Screen tents are used in outdoor locations such as while camping in a forest and are free-standing. However, they can also be designed to be affixed to an overhanging support like the branch of a tree.

• Windows with fly screens are commonly seen in homes in rural areas or areas that are infested with mosquitoes or any other insect. The netting is attached to the window frame and provides enough protection even while people are moving around indoors.

Where Are Fly Screens Used?

Fly Screens are commonly used in areas where diseases such as malaria or any other insect-borne diseases are prevalent. Care has to be taken to ensure that the netting that is being used is fine enough to keep the insects out. If the area inside the mosquito net is very small, there are chances of insects biting the sleeping person, through the mesh. This is where insecticide-treated nets come into the picture.

ITN’s And Their Advantages

In the 1980’s fly screens were dip-treated with insecticide such as permethrin or deltamethrin and are called insecticide treated nets or ITN’s. They are considered to be twice as effective as nets that have not been treated as they not only keep mosquitoes at bay but repel them too. They also afford 70% more protection in comparison with not using a net at all. The insecticide does not have a permanent effect and the nets have to be treated every 6-12 months in order to stay effective. These nets are available for around $2.50–$3.50 from the UN, the WHO and other non-profit organizations and are a cost-effective malaria prevention method.

Disadvantages of ITN’s

Those who use ITN’s are protected from mosquitoes but there is a downside to this type of net. Those who are sleeping outside the net tend to experience an increase in the bite rate. This occurs because the mosquitoes are repelled by the insecticide, get deflected from the outer surface of the netting and attack those who are sleeping around the net.

Free Distribution Issue

Some experts are of the opinion that these nets should be distributed free of charge, by international organizations. Others maintain that cost-sharing between the users and the organizations make people value the product more. Some studies that were conducted in Kenya suggested that cost-sharing only encouraged a decrease in demand and that when it comes to saving lives and increasing coverage, free distribution of ITN’s is a better option. By distributing a large quantity of nets in a particular area, the chemical additives that they contain help in reducing the total number of mosquitoes in the surroundings. Resultantly, the chances of malaria infection are also greatly reduced.

Advantages And Types Of LLIN’s

ITN’s are not really a feasible option in rural areas, as they have to be re-treated. Instead, long-lasting insecticide nets or LLIN are now the preferred alternative in most countries. The cleverly-bound insecticide in these nets gets released over a period of 4-5 years and is thus a long-lasting option. These nets serve a dual purpose. They act as a physical barrier against mosquitoes and any insect that comes in contact with it also perishes. Generally, donor groups such as the Bill and Melinda Gates Foundation purchase LLIN’s and deliver them via internal distribution networks.

There are three different types of LLIN’s. Polyester netting with an insecticide-binding on its external surface, polyethylene netting with insecticide-incorporated fibre and polypropylene which is made of insecticide incorporated fibre as well. It is possible to wash all these varieties a minimum of 20 times though the durability of each material will vary.

Polyester nets tend to last for 2-3 years, polyethylene and polypropylene LLIN’s could last for anything from 5-7 years. When the cost: longevity ratio is taken into consideration, more expensive netting that lasts longer proves to be more cost-effective. Apart from this, replacing nets proves to be a logistical challenge and those costs have to be taken into consideration as well.

Fly Screen Alternatives

Fly screens act as a barrier for mosquitoes but they also obstruct air-flow to a certain extent. In tropical areas, in homes where air-conditioning is not available, sleeping under netting is definitely hotter than sleeping without it. There are some alternatives:

• A fan can be used in tropical areas. Mosquitoes prefer and can move around easily in still air and a fan increases the air-flow inside a room and acts as a deterrent for mosquitoes. However, this method is not as effective as using netting is.

• Insect repellent can be applied to the skin. This again is not as effective as a net but reduces the number of bites. A disadvantage of repellents such as these is that they work out to be more expensive and long term use poses health risks.

• Insect repellent-treated clothing can be worn. This offers long-lasting protection and no re-application is necessary. This kind of protection is invisible and in most cases, odourless as well. Unlike insect repellent applications, the clothing is near the skin and not on it. This eliminates concerns about misuse or overuse of insect repellents.

After studying all the advantages and disadvantages of the range of mosquito repellent methods, the one fact that prevails is that mosquito netting is one of the safest, easily available and cost-effective options available.
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Insect Proof Screening - Standard Types
Standard Types
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