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Which of the accessories gives the best protection from overheating?
According to the DIN 5034-1 norm rooms should be protected from overheating with the use of external accessories (awning blind, roller blind) which give better protection than internal accessories.
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How does it work in reality?
FAKRO has compared the protection different accessories offer against overheating. In a test, eight identical investigation boxes were fitted with the same type of roof windows and exposed to the sun’s rays. The windows were shut and the temperature was taken one metre above the floor at several different places. The windows then had accessories installed and retested to measure the improvement.
The results of the these test (shown above) show clearly that external accessories (awning blind and roller blind) provide the best protection from outside heat. The external accessories stop the sun’s rays from reaching the glass, reduce the heat flow and help prevent the room from overheating.
Internal accessories also offer protection from the heat but to a lesser degree than external accessories. Their main function is to decorate the space and regulate the amount of light entering the room. Considering the effectiveness of sun protection together with price and ease of installation, the best protection is provided by an external awning blind.
The external awning blind together with an internal accessory installed on a FAKRO roof window creates a set of accessories which ensures the highest levels of comfort in the loft space, providing a solution that looks attractive and also controls the amount of heat and light entering the room.
\"The space should be protected from overheating on summer days with use of external covers placed outside the glass which reflect the heat. The overheating of rooms is a result of absorption of global radiation by objects in room and sufaces which delimit the space (walls, floor). The absorbed radiation changes into long-wave infrared radiation. (heat radiation), which does not pass the glass and causes undiserable overheating.\" - DIN 5034-1
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