What is Backcheck

 Backcheck is a feature that can be added to door closers to slow the opening of a door to avoid it hitting against a wall.  Depending on closer make and model this can be either fixed or adjustable

What Is Backset

The Backset of a locks-latch is the distance from the edge of the door to the pivot point of the knob-lever.

What Is Cam Action

Cam action door closers allow light opening force but strong closing force

What Is Delay Action

Holds door open for a set period time before closing allowing disabled wheel chair access