Door and Frame Offerings carry ratings up to STC 66.

Press Release Summary:

For applications requiring sound resistance from STC 56–66, Whisper Core(+) complete door and frame solution meets or exceeds such third-party testing standards as ASTM E90, E1332 and E413; carries 46 OITC rating; and complies with HMMA 865 and SDI 128 specifications. System consists of 2 flush single swinging hollow metal doors within single frame forming communicating opening. Cam lift hinges, flat saddle thresholds, and adjustable door bottoms ensure doors seal completely.

Original Press Release:

ASSA ABLOY Group Brand Fleming Door Products Introduces Communicating Opening System with Industry Leading Sound Transmission Class (STC) Rating

NEW HAVEN, Conn. -- ASSA ABLOY Group brand Fleming Door Products has expanded their STC door and frame offerings to include a communicating door opening with an ultra-high STC 66 rating. Whisper Core(+ )is a complete door and frame solution for applications requiring sound resistance ranging from STC 56-66.

"We're pleased to provide a solution for building owners who want exceptional sound attenuation in industrial and manufacturing facilities, sound studios, medical areas, or many other applications," said Howard Schrier, Director of Hollow Metal Specialty Products, ASSA ABLOY Door Group. "The design of these systems enhances usability of a space by providing strong sound containment via interior and exterior openings that are highly reliable and made to last. This assembly is very exciting for us since it leads the industry in sound attenuation for 1-3/4" thick doors."

Whisper Core(+ )door and frame system meets or exceeds the following stringent third-party testing standards:

--  Tested to ASTM E90, E1332 and E413 rating of STC 66

--  Outdoor/Indoor Transmission Class (OITC) rating of 46

--  Compliant with HMMA 865 and SDI 128 specifications

Whisper Core(+ )door and frame system consists of two flush single swinging hollow metal doors within a single frame forming a communicating opening. It utilizes cam lift hinges, flat saddle thresholds and adjustable door bottoms to ensure the doors seal completely and function easily. Fleming Door Products doors and frames were tested with locking hardware from ASSA ABLOY Group brands, for a complete opening solution.

About Fleming Door Products

Fleming Door Products is one of North America's fastest growing steel door and frame manufacturers due to it's commitment to quality, service, product development and the use of state of the art technology.  Fleming Door Products depth of product offerings and fire rating capabilities combine to make it one of the most complete product lines of steel doors and frames and steel fire doors and frames in the world.


ASSA ABLOY is the global leader in door opening solutions, dedicated to satisfying end-user needs for security, safety and convenience.

CONTACT: Kenny Webb, Director of Wood and Aluminum Marketing and Communictations, ASSA ABLOY Door Group, 832-300-3618,

All Topics