Fire Rated Acoustic Doors University of Minnesota - Northrop Auditorium

University of Minnesota - Northrop Auditorium

Doors up to 65 Feet x 65 Feet

Sound Isolation to STC 60

Custom Engineered Doors

Sliding Doors Without Floor Track

A Guide to the Meaning of Sound Levels

Sound Level dB (A)	Type of Noise	Noise Level Effect
0	Threshold of hearing	inaudible
20	Rural Environment	Extremely quiet
25	Bedroom	Quiet house
40	Living room	Distant sounds audible
50	Background conversation	Moderate
60	Normal conversation	Moderate to loud
85	Average street	Traffic loud
100	Pneumatic road drill (very loud)	Very loud
110	Pop group deafening	Deafening
125	Jet take-off 100m distance	Deafening
140	Jet engine 25m distance	Threshold of pain

Sound Transmission Class Examples

STC Sound Absorbtion	What can be heard
25	Normal speech can be understood quite easily through wall
30	Loud speech can be understood fairly well, normal speech heard but not understood
35	Loud speech audible but not intelligible
40	Onset of 'privacy'
42	Loud speech audible as a murmur
45	Loud speech not audible; 90% of statistical population not annoyed
50	Very loud sounds such as musical instruments of stereo can be faintly heard; 99% of population not annoyes
60+	Superior soundproofing; most sounds inaudible

Door Capabilites

Door type	Max. attenuation -STC
Single leaf swing - Pedestrian	STC50
Double leaf swing - Pedestrian	STC49
Single/Double swing (High Spec)	STC55/57
Single leaf swing - Oversized	STC56
Double leaf swing - Oversized	STC53
Single horizontal sliding	STC60
Double horizontal sliding	STC53
Single vertical sliding	STC56
Double vertical sliding	STC53
Triple vertical sliding	STC50
Tandem doorsets	STC75

N.B. The final performance of any door solution will be subject to the detailed design decisions made, we would be happy to provide early advice.