UL - 228
UL Standard for Safety Door Closers-Holders, with or without Integral Smoke Detectors
|Publication Date:||29 April 1997|
These requirements apply to swinging door closers equipped with integral electromechanical or electromagnetic holders and which may be provided with integral smoke detectors. These requirements also apply to electromagnetic door holder units which are for use with a separate door
closer and separate automatic fire detector.
When integral smoke detectors are provided with the combination door
closer-holder, the smoke detectors shall comply with requirements for
smoke detectors of the photoelectric or combustion products type.
Requirements for the installation of these combination door
closers-holders with or without smoke detector units are included in the Standards of the National Fire Protection Association for Installation of Fire Doors and Windows, NFPA 80, and Automatic Fire Detectors, NFPA 72E.
The combination door closers-holders (with or without integral smoke detectors) described in this Standard provide one of the following types
of hold open functions:
a) Single point hold open.
b) Multiple point hold open. (Two, three, four, etc. discrete
hold open points as set at the manufacturer's plant.)
c) Infinite hold open points with one as set by the user.
A product that contains features, characteristics, components,
materials, or systems new or different from those covered by the requirements in this Standard, and that involves a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements to determine that the level of safety as originally anticipated by the intent of this Standard is maintained. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this Standard shall not be judged to comply with this Standard. Where appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard.
*1.5 revised January, 21 1999*