Acoustical Doors and Frames NEW Whisper Core STC 56 thru 66 System Fleming Products is proud to announce the addition of an ultra highSTC 56-66 hollow metal door and frame system to the Whisper Coreacoustical product line. This will serve as a complete solution forassemblies requiring sound resistance from STC 56-66. Whisper Core+ STC 56 thru STC 66 System Whisper Core+ STC 56 thru STC 66 System Press Release /global/scaled/2205x798x24x422x760x-1/Other-Fleming-NEW IMAGES-girl_volin.jpg Whisper Core Door Systems - The Sound Choice for Acoustical Solutions Fleming is proud to introduce a wide selection of operable STC (Sound Transmission Classification) doors to its product line. The new Whisper Core Door Systems product offering uses the latest patent pending sound absorbing technology, and includes many options such as, pairs of doors with cylindrical and exit hardware, single doors with rim panic devices, and military/government locks. Whisper Core Door Systems are the noise solution for any facility including, airports, healthcare, hospitality, government/military and municipal buildings as well as educational institutions.