Shanxi stainless steel retractable door market found good reason, from stainless steel to build the retractable doors are relatively inexpensive inexpensive, beautiful workmanship, but also play the role does not rust, so the market sales accounted for 80% of total market sales of the door. But selecting retractable door is also very important, experts say good retractable door outside the United States should ensure that, even paint, no drip tears. Then the janitor and lock size of the gap, the gap as small as possible. Good retractable doors and door frames should be coupled with stairs, with bite, no sound explanation pushed a small gap. From the foregoing optional retractable doors have three steps: First, knock. Hand knock listen to the sound, solid core is muffled, hollow core sound is very loud, and there is a sense of resonance. The second step, to see. By cat or locked keyhole view into the interior. The third step is feeling. Feeling the weight of the door by door open, and then determine the thickness of the door leaf weight of the door is reasonable. 

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