A double cylinder lock requires a key to operate the door from either side.
Double cylinder locks illegal.
Double cylinder deadbolts are therefore not ideal for emergency exits.
Typically the outer casing is made from hardened steel and resilient against hammer blows.
These locks require a key to lock or unlock the door both from the outside and the inside making them a little safer in one regard.
When i was a los angeles county deputy sheriff i had the sad observation of seeing a young woman who was killed by smoke inhalation.
A double cylinder lock requires a key to be opened from both the inside and outside which could leave you trapped in your home during an emergency.
In short it is helpful only if an easily broken pane of glass would allow access to the thumb turn of the lock but not passage into the house.
Dual cylinder deadbolts require a key to open the deadbolt from both the inside and outside.
Without a button lock mechanism intruders cannot unlock the door manually.
The locks have no handle.
Now under what circumstances is a double cylinder lock helpful.
Deadbolt locks are made to withstand amateur attempts at illegal entry.
While this isn t the official phrasing in the fire code double cylinder locks are both dangerous and illegal.
Double cylinder locks are an extra layer of protection for home and business security.
The interior thumb turn can be removed to create a keyhole.
Jay staats 4 years ago.
One important disadvantage is the extra safety concern.
In the u s there is no single comprehensive law against dual cylinder deadbolts.
Replacing single cylinder locks with double cylinder models may reduce successful break ins by 50 or more.
These locks can create an issue for quick exit if a fire or other hazardous situation occurs.
Double cylinder locks are a big no no.
There s a reason people want to equip their homes with double cylinder locks.
Even when the door is considered or designed for use during emergency only double cylinder deadbolt should not be installed in it.
Danger of double key locks.
The last person out the house.
Illegal in some states.
Fire safety issue solved.
Only lock the double cylinder deadbolts when everyone is away unable to monitor the premises.
For example if there s a window on or nearby the door think of sidelight windows.
Also you must have an emergency escape plan.