https://developer.valvesoftware.com/..._door_rotating
Flags
1 Starts Open - This door spawns open.
2 Reverse Dir - This door opens in the opposite direction.
4 Non-solid to Player - This door does not collide with the player or NPCs.
8 Passable - This door does not collide with anything.
16 One-way - This door only opens in one direction.
32 Toggle - This door switches between open and closed on each input.
64 X Axis - This door rotates on the X axis.
128 Y Axis - This door rotates on the Y axis.
256 Use Opens - The +use key triggers this door.
512 NPCs Can't - NPCs can't use this door.
1024 Touch Opens - Collision with the door triggers it.
2048 Starts locked - This door spawns locked to the player or NPCs (though an input can still trigger it).
4096 Door Silent - This door makes no noise.
Ignore Debris = 1
Blocking Damage = 9999
Spawnflags = Remove 8
to find the keyvalues, open hammer and save a VMF, or open the games FGD and search the entity name. You can then alter the entity with stripper_source or a tool such as entspy.
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