Outdoor-Indoor Transmission Class
- Outdoor-Indoor Transmission Class
Outdoor-Indoor Transmission Class (OITC) is a standard used for indicating the rate of transmission of sound between outdoor and indoor spaces in a structure. It is based on the ASTM E-1332 Standard Classification for the Determination of Outdoor-Indoor Transmission Class. An alternative similar standard for determining the rate of acoustic isolation of a separation between spaces is STC.While STC is based on a noise spectrum targeting speech sounds, OITC utilizes a source noise spectrum that considers frequencies down to 80 Hz (Aircraft/Rail/Truck traffic) and is weighted more to lower frequencies. [http://www.viracon.com/viraconsultingTerms.php]
Links:
#ASTM International: [http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/REDLINE_PAGES/E1332.htm?E+mystore]
#Viraconsulting Glossary: [http://www.viracon.com/viraconsultingTerms.php]
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