UL Listed Fire Safety Storeroom or Closet Door Mortise Lock-DDAL07

A UL Listed Fire Rated Mortise Lock with this function is specifically designed for doors that must remain locked at all times from the outside, with access strictly controlled by key, while ensuring free exit from the inside.

Model:
DDAL07
Brand:
D&D Hardware
Certification:
UL 10C fire rated 3 hours
Material:
Stainless Steel
Color:
Silver
Application:
Wooden Door, Metal Door

Finish:	SSS Black Gold
Availability:

Quantity:



Inquire Add to Basket

新详情3 logo3

What are the applications for Storeroom Function UL Listed Mortise Locks?

Electrical / Mechanical / Equipment Rooms

Why: These rooms contain critical building systems (HVAC, electrical panels, elevator machinery) that must be secured against unauthorized access at all times.
How it works: The outside lever is always locked. Only authorized maintenance personnel with a key can enter. Inside, workers can exit freely at any time without a key, preventing accidental lock-ins.
UL Listing relevance: If the door is part of a fire-rated wall (required for mechanical rooms), the UL Listing ensures the lock maintains the fire barrier integrity.

2. Janitorial / Housekeeping Closets

Why: Cleaning supplies and chemicals must be secured, but staff need quick access.
How it works: Custodians use a key to enter. Once inside, they can exit freely by simply turning the inside lever, even with arms full of supplies.
UL Listing relevance: Many janitorial closets open onto corridors and require fire-rated doors. The UL Listed lock ensures compliance.

3. Storage Rooms (General / High-Value)

Why: Secures inventory, supplies, or equipment from theft or tampering.
How it works: The outside lever is always rigid. Only key holders can enter. The auxiliary dead latch prevents the door from being shimmed or forced open with a tool.
UL Listing relevance: If the storage room is interior and not fire-rated, UL Listing may not be required, but if the door is on a rated corridor, the lock must be UL Listed to match the door's fire rating.

4. Stairwell Doors (When Secured on One Side)

Why: In some buildings, stairwell doors are locked on the stair side to prevent re-entry from stairs into floors, but must allow free egress from floors into stairs.
How it works: The outside lever (stair side) is always inoperative. Occupants exiting the floor into the stairwell push through freely. To re-enter the floor from the stairs, a key is required (or the door is designated as "no re-entry").
UL Listing relevance: Stairwell doors are almost always fire-rated. A UL 10C Listed lock is mandatory.

5. Emergency Exit Doors (with Access Control)

Why: Some exit doors must remain locked from the outside for security but must allow instant egress from inside (e.g., rear exits in retail, side doors in offices).
How it works: The outside lever is always rigid. Inside, the lever is free for immediate exit. If electronic access control is added, a key override is often required.
UL Listing relevance: Exit doors are typically fire-rated and must comply with NFPA 80. A UL Listed lock ensures the door assembly remains compliant.

6. Hospital / Clinic Restricted Areas

Why: Medication rooms, sterile supply closets, or laboratories must be secured against unauthorized entry.
How it works: Only authorized medical staff with a key can enter. Inside, staff can exit freely, which is critical in emergencies.
UL Listing relevance: Healthcare facilities require strict fire and life safety compliance. UL Listed hardware is often specified.

7. School / University Storage and Service Areas

Why: Secures maintenance closets, athletic equipment rooms, or AV storage.
How it works: Outside lever always locked. Key access for authorized staff. Free egress from inside prevents students from being accidentally locked in.
UL Listing relevance: Educational occupancies require corridor doors to be fire-rated. The lock must match the door's fire rating.

Why the Auxiliary Dead Latch Matters?

The auxiliary dead latch is critical for storeroom function locks because:

It prevents "loiding" or "credit card attack" (shimming the latch bolt).
It ensures that even if the outside lever is inoperative, the door cannot be forced open by manipulating the latch.
It enhances forced-entry resistance, which is essential for securing storage and mechanical rooms.

Fire Rating Compliance

A UL Listed Fire Rated Mortise Lock with storeroom function must be:

Tested to UL 10C (positive pressure fire test)
Rated for the door's fire protection period (UL 10C 3 hours)
Marked with UL label on the lock case or packaging
Installed with matching fire-rated hinges, closers, and gasketing to maintain the assembly's rating