Like buying anything in life, there are 100's of choices of supplier and product. Just like buying a TV or washing machine, certain products have more features or are built for longer life.
Now the phrase ''You get what you pay for'' is not always true, but it should be a clear indicator if you have received two quotations which seem to be miles apart in price.
The most common misconception is that a door is a door. Having worked in the automatic door Industry for over 10 years I can tell you this is not true. The most common cost cutting procedure I see from companies is not fitting certain items.
The Automatic door association runs regular testing programs for automatic door engineers in the UK, where they test the knowledge of the Engineer to confirm he understands the standard the door should be installed to. Each engineer that passes is supplied with a unique ADSA Number to confirm their competence.
http://autoslidingdoors.webnode.com/
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