Access Control egress
This is a Elementary School
If we install card reader to enter building and card reader to exit building, I understand I would need an additional means of egress, exit button to break power to maglock in case of emergency.
Which building code and year has you r city currently adopted?
Most educational buildings require panic hardware
You might be required panic hardware and especially would be required if already installed.
Normally getting into the building, the codes do not care, exiting is another thing.
Normally you are only allowed one operation to exit a building, hit the panic hardware, or use the door hardware.
Your best source for the correct answer is the local building and fire department fire prevention/ fire marshal
Ok so if I use a Card reader to exit, I would be required to use another for panic correct which can be an exit button with a cover and sounder to prevent kids from pushing the button.
I would say if you are a school,,
The doors are required to have panic hardware, and there can be no other locking device, normally
Panic-hardware as in the push bar across the door.
A mag-lock wouldn't be my first choice in a school - especially a mag-lock that's released by a sensor (vs. a mag-lock that's released by a switch in the door-mounted hardware). The model codes do allow a mag-lock to be used on a door with panic hardware, but these are my concerns about a mag-lock with sensor release:
I would use electrified hardware that allows free egress - like electrified lever trim for panic hardware or electric latch retraction panic hardware. Both of these functions would accommodate an access control reader, would allow centralized lockdown, and would meet the requirements for egress without any additional release devices.
You mentioned a card reader to exit the building. If this door is a required means of egress, the door has to provide code-compliant egress and a building occupant can not be forced to present a card or other credential in order to unlock the door. If you want to monitor who is using the door, the interior card reader could shunt an alarm but not control the lock. The 2018 IBC allows delayed egress locks in schools when the door is serving a classroom with an occupant load of less than 50, so in that case the interior card reader could shunt the delay and alarm.
Depending on what the existing door hardware is,
If it is panic hardware, which more than likely it should be, If you do an electric strike on the door, the panic hardware will still operate as designed,
And, you can use a card reader on the outside, to release the electric strike and allow a person it, or add a button, also, in the office to buzz people in.
My experience tells me using card reader on the egress side of a door to shunt the emergency alarm and delayed release locking is not good. I have observed these in health care facilities. The card reader electric lock shunting took the place of the manual reset function so the door would re-lock after each card reader use after the electric lock was released by the releasing device [126.96.36.199.1.1 (3) (d)]. A timely event for multiple people trying to egress through the locked door. The door hardware installer was interviewed and had no idea he was violating the code by installing the card reader electric lock shunt on the egress side of the door.
You will see the answer is not that simple when dealing with codes for special locking.
In terms of the 2018 NFPA 101 Chapter 15 Existing Educational Occupancies there are two special locking arrangements that allowed:
The school will most likely have an assembly occupancy such as a gym or an auditorium so those doors in the means of egress must additionally comply with Chapter 13 Existing Assembly Occupancies:
NFPA does not rely on the magnetic lock for egress taking into consideration that the magnetic lock might not be release for a certain reason in case of fire, all doors should be free to exit from inside, even according to the special locking provisions in Chapter 7, you install a magnetic lock , it should be linked electrically to the operation of the handle and be released in case of fire
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