Choosing the Right Locking Option for Double-Sided Security

This article explains the differences between lock options that can secure a door from both sides.

• A letterbox
• Pets
• Children
• Elderly residents (including additional care needs)

Overview: How the Locks Differ

EF / SS — Safety Button Locking

• Locking is controlled using a safety button on the inside
• When the safety button is engaged, the door is locked from both sides
• Locking and unlocking are manual actions

DFF / DWF — Automatic Double Locking

• The door automatically locks from both sides as soon as it is closed
• No button needs to be pressed
• Locking happens every time the door shuts

EF / SS in Detail (Safety Button)

How it works

• The safety button is located on the inside of the door
• When activated:
  
  • The door is locked from inside and outside

• When deactivated:
  
  • The door functions normally

Opening the door

• From inside:
  
  • The safety button can be deactivated manually
  • No key is required to exit

• From outside:
  
  • The door can still be opened using the approved unlocking method

Key characteristics

• Locking is intentional, not automatic
• The user controls when the door is double-locked
• Requires awareness to activate or deactivate the safety button

DFF / DWF in Detail (Automatic Locking)

How it works

• The door locks automatically as soon as it is closed
• Locking applies to both sides every time

Opening the door

• From inside:
  
  • The door cannot be opened directly
  • An unlocking method must be used

• From outside:
  
  • An unlocking method must be used

Key characteristics

• Locking is automatic and consistent
• No risk of forgetting to lock the door
• Opening the door can take slightly longer due to the unlocking process