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Opened and closed things are opening and closing.
開閉 is a relatively formal word to refer to the action of opening and closing physical objects such as doors, shutters, or valves. You often see it in instruction manuals or product descriptions.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
バルブの開閉
opening and closing of a valve
戸の開閉
opening and closing of a door
ドアの開閉
opening and closing of a door
これがとびらの開閉スイッチです。
This is the open and close switch for the door.
このボタンで電車のドアの開閉をするんです。
You use this button to open and close the train doors.
車に乗りながらリモコンでシャッターの開閉が出来るので、すごく楽になりました。
Being able to open and close the garage door shutters with a remote while in the car has made things a lot easier.
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