Most of these windows have an efficient security system. These windows can be framed with stainless steel or aluminium. There is a large range of windows design for them. It also has a large range of glass options to be used. The bottoms of sashes are secured by flush bolts. Usually, foam wrapped PVC is used between sashes and frames. There are many options for hinges. The number of hinges depends on the size of the window. Modern windows that are bi-folding have insect screens to control the mosquito and sand flies.

These windows are mostly insulated. This will benefit customers in summer by saving them from big problems. These windows with good weather sealing around the window sashes control the air infiltration. Even there are many seals but the ones which bi-fold use double seals to completely prevent the airflow. Most of the manufacturers are using double or triple glazed glasses. Though they are expensive but are good insulators against both heat and sound. One may consider low energy-efficient glass or window film rather than glazed glass. It is a cheaper alternative.

Frames of these windows have a large variety. There is a huge variety of materials for their window sashes. They are different as they conduct heat differently. Metal frames can allow plenty of heat to flow. But other materials do a better job than the conducting frames like iron. Some of the examples are timber, PVC and fibreglass sashes. There are more moving parts in such windows. Manufacturers, therefore, tend to use head and sill tracks for smooth operation.

There are a number of designs and styles available for these windows. There is a range of glazing choices, including many different types of glass choices. Mostly plain glasses are being used. But these are used in a variety of glazing bar designs. This will help us make a variety of window style configuration.

Aluminium is stronger than timber and PVC. It, therefore, can support more glass. Aluminium made such doors and windows are resistive to flexing and twisting. In this way, no contraction and expansion can occur with heat variation. This best suits to corner or bay windows. They are lightweight and easy to open or close. Thermal efficiency is another characteristic to be considered. Aluminium doors seem to be more environment-friendly when considering thermal efficiency. The environmental impact of the production of aluminium can be lowered by using recycled aluminium.

The cost of such windows is highly dependent on the material used. Design, size and style also account for the rise in price. In general, the price varies from $1300 to $3200 in Sydney.