Door and Hardware Institute: Professional organization that serves to educate and set standards for the door and door hardware organization.
(http://www.dhi.org)
Warnock hersey: North Americas leading product safety and performance mark for building and construction products.
(http://www.intertek-etlsemko.com)
Underwriters Laboratories: UL is the trusted source across the globe for product compliance.
(http://www.ul.com)
National Fire Protection Assoc: The authority on fire, electrical, and building safety.
(http://www.nfpa.org)
