Certain devices and technologies are available to ensure that doors automatically close themselves, either for security's sake or to help control accidental heat loss or gain.
Power Door Closer Mechanisms – Delta Entrance Systems
Automatic Aluminum Door Self Closing Mechanism for Door (DT-82) - China Door Closer, Door Lock
Heavy Duty 4 Inch Self-Closing Spring Loaded Door Hinge With 5/8 Corners (3 Pack, )
NITTO NSC Sliding Door Closer 10-60kg - (Hold Open and Damper)
Self Closing Hinges for Doors
Fire door closer buyer's guide - Door Superstore Help & Advice
10500 Series 2 Door Credenza Finish: Mahogany : Office Products
Saudi Basic Industries Corporation
how to install self closing door hinge
Self Closing Sliding Door Mechanism - Temu
Automatic Door Closer Safety Spring Practical Easy Install Controller
LINEAR® SELF-CLOSING KIT Electric opener By PROTEK®
HON 10700 H107291 Storage Cabinet
Single Door Self Closing Mechanism With Soft Close Damper & 24Vdc
Unique Self Closing Door Closer Mechanism