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2. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   Modern manual door closer Eclipse door spring and separate checking mechanism. A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior.

3. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   Wall-mounted electromagnetic door holder securing a door in the open position. An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.

4. 25 Finds That Unexpectedly Turn Into Every Day ... - AOL

   www.aol.com/lifestyle/25-finds-unexpectedly-turn...

   #8 A Magnetic Screen Door Is The Perfect Solution If You Want To Let Your Pets In But Keep The Bugs Out Review: "I love this screen for my balcony door! Easy to put up and does a great job!

5. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.

6. Fire door - Wikipedia

   en.wikipedia.org/wiki/Fire_door

   Door clearances at the door edge of the door frame (Wood Door), on the pull side of the door, do not exceed clearances listed in 4.8.4 (the clearance under the bottom of the door shall be a maximum of 3/4") and 6.3.1 (top & edges 1/8") Metal door (top & edges up to 3/16") The self-closing device is operational; that is, the active door ...

7. This is why you should always close the interior doors in ...

   www.aol.com/news/why-always-close-interior-doors...

   Closing your interior doors can help disperse pressure throughout the home and reduce the overall force stacked up against your roof -- basically your first line of defense against Mother Nature.