Willoughby Model WLS-1770 3 hour Mortise Detention Lock for use in listed and labeled detention metal fire door assemblies rated up to and including 3 hour durations.
Model
- WLS-1770 3 hour Mortise Detention Lock
See steel detention door and frame manufacturer’s listings for additional assembly information and limitations of use.
Limitations
| Maximum Sizes/Configurations |
| Single Swing |
3-0” wide by 7’-0” tall |
| Standard Pairs |
Not Allowed |
| Double Egress |
Not Allowed |
Evaluated to the following
Unless otherwise noted, the product listed above in this section has been evaluated for conformance to the following standards:
- UL 10C – Positive Pressure Fire Test of Door Assemblies
- NFPA 252 – Fire Test of Door Assemblies
- CAN/ULC S104 – Standard Method for Fire Test of Door Assemblies
