1. Function

Excellent light transmisson, easy cleaning, fly and insect resistance

2. Features

(1) Adjustable torsion: applying turbine worm structure to adjust pretightening force, customers could regulate worm

based on personal interests to make sure that the speed of opening and retraction could meet the customers

requirements

(2) Press-button lockup: invisible lockup device, which could lock up inside the spare parts, has the features of flexible

opening and closing, eay to use, tidy apperance, stable lockup, long lifetime period

(3) Durable and lasting: self-innovative design on retractable device, durable and strong retraction, no deformation

after being retracted 40000 times

(4) Exquisite production: rigorous producing requirements to assure intact appearance and quality, tiny gaps when

assembling

(5) Self cleaning: the self cleaning device at the exit of Yam box could clean dust on screens automatically when

opening and closing to guarantee the clean and tidy surface

3. Application

Applied to various kinds of windows and doors