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As you all know that Häfele has full range of flap fittings which includes not only the simplest gas spring, lid stay, heavy duty flap fittings but also the motor-driven flap fittings. It satisfies with all requirements for flap fittings regarding to diversified levels and applications.
DUO is such an outstanding fitting which has been existed in the market for over 10 years. 100% made in Germany guarantees the best quality of DUO. The current DUO keeps all original functions, in addition, it's be redesigned by a slim shape based on Chinese market request. It still adopts zinc alloy as its main body material and keeps nickel plated finishing.
DUO has two product categories, DUO 3667 and DUO forte 3666. These two are suitable for flap height 500 mm and 700 mm respectively. Besides the length, they have same features on other aspects:
Thanks to its friction coupling construction inside instead of normal wheel gear mechanism, DUO has the longest life time than other products in the market now. This design allows avoiding frequent adjustment and unnecessary wear and tear. DUO series passed 60,000 cycles durability test which is far beyond the LGA standard requirements - 30,000 times. Moreover, DUO only needs to be adjusted maximum 3 or 4 times within its entire life long period.