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250N single small synchronous chain window openers are used in natural ventilation or smoke removal, suitable for top hung, casement window etc.

1400N LK-THC Twin Heavy Chain Window Openers are widely used for awning, skylight and roof window. They are ideal for the windows wider than 1400mm.

Twin Chain Window Openers are widely used for top hung, casement and skylight window etc. They are ideal for the windows wider than 1400mm.