Low-E coatings are also applied to thin sheets of transparent film and suspended in the cavity between glazings. This process is often used to create a triple glazed unit without the added weight of a third pane of glass. (SHOW DIAGRAM)
Some films are designed to combine low emissivity with reduced solar gains making them effective for certain west facing exterior doors and skylights if solar gains are a severe problem during the summer. This may have the effect of using more energy in the winter so care must be taken to ensure the right film is used in the right application.
Is the use of suspended films in glazing for doors and skylights a common practice?
Some manufacturers offer films in doors, films may not be used in skylights.