SITE VISIT REPORT
DATE: 12/14/2004
TO: Jerry Morgan, Spirit Acoustics
FROM: Martin Alexander
PROJECT: Ortho Biotech, Bridgewater, NJ
Office Isolation Measurements Before and After
PRODUCTS INSTALLED:
A. Speech Guard Light Fixture Enclosure
B. Shield Guard Tile Enhancer
Martin Alexander, P.E.
consultant in acoustic vibration
63 Passaic Avenue
Summit, NJ 07901
908-522-9442
908-522-0361 (f)
marty.alexander@alum.mit.edu
Measurements were made with a Bruel & Kjaer Type 2250 Precision Sound Level Meter/Real
Time Analyzer to test the effect of speech guard and shield guard on the 14th of December in
2004. Measurements are summarized below.
Table 1 : Octave Band Measurements
| Location | 63HZ | 125 HZ | 250HZ | 500HZ | 1000 HZ | 2000 HZ | 4000 HZ | 8000 HZ | NIC |
|---|---|---|---|---|---|---|---|---|---|
| 1. Third Floor Untreated | 20 | 20 | 17 | 25 | 26 | 29 | 34 | 35 | 27 |
|
2. Third Floor Treated – Speech Guard Treated – Shield Guard |
14 | 18 | 30 | 43 | 44 | 45 | 50 | 52 | 42 |
| 3. Third Floor Treated with Shield Guard only |
20 | 16 | 15 | 44 | 39 | 39 | 42 | 46 | 36 |
| 4. Second Floor Untreated |
14 | 18 | 18 | 23 | 24 | 31 | 38 | 43 | 26 |
| 5. Second Floor Treated – Speech Guard Treated – Shield Guard Treated – 1″ Acoustic Wall Panels |
26 | 25 | 28 | 37 | 46 | 52 | 57 | 54 | 41 |
End Of Report