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In general, the NFC CARD technology is the least of your concerns when it comes to implementing access control at a school. At the top of the list of expenses would be the purchase and installation of perimeter control. Without proper fencing, no access control system would be worth anything. Similarly, turnstiles (devices used to allow one person through a gate at a time) can be quite costly and one would normally need a number of these to allow acceptable entrance rates into/out of the school premises.
A general rule of thumb for combo cards biometric devices would be to allow for a maximum of 8 learners per minute through a turnstile. This means that if you need to grant access for 500 children onto the school terrain between 07:10 and 07:30 am, an average of 25 children would arrive at any minute during that time. We know that this is not the case though. Of the 500, 350 would probably arrive within the last 10 minutes before the school starts. To allow 350 kids access through contactless cards controlled turnstiles within 10 minutes, would require 3-4 turnstiles to be installed.
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