The LCN closer fluid "Liquid X" will perform without variation between:
-30° F to +120° F - for manual closers.
+35° F to +120° F - for electrical closers and automatic operators.
At around ...
The Von Duprin M996 trim has been evaluated to -4F (-20C).
Locking / unlocking responses may be slightly slower at this lower temperature value.
If you have further questions about a spec...