1. Limited silencer connection sizes | 
"Fit-the-duct" silencers
"Fit-the-AHU" silencers | Baystate Medical Center
Charles Tupper Building
Read more |
2. Low frequency noise | 
Low frequency silencers | Waterpark Office Building
Metro Center
Ajax-Pickering Hospital
Gravenhurst Institute
One London Place
CBC Headquarters
Read more |
3. Insufficient straight duct | 
Elbow silencers
Transitional silencers | Baystate Medical Center
Metro Center
Metropolitan Life Building
Motorola Facility
Autoroute Tunnel
Power Station
Gateway Arena
Elbow silencers SS5
Transitional silencers SS6
Read more |
4. Duct breakout noise | 
HTL silencers
HTL ductwork | Charles Tupper Office Building
One London Place
Gateway Arena
CBC Headquarters
Ajax-Pickering Hospital
HTL silencers SS7
HTL ductwork SS7
Read more |
5. Compounded problems | 
Various products | Read more |
6. Rooftop unit noise | 
Elbow silencers
HTL silencers | Film House Studios
Niagara Casino
Nortel Plant Infrastructure
Camden Amphitheater
Elbow silencers SS5
HTL silencers SS7
Read more |
7. High velocity airflow | 
"EX" model silencers
Low Pressure Drop silencers | IBM Celestica
Chicago Tribune Office Building
UofT Power Plant
Read more |
8. Excessive pressure drop / energy consumption | 
"EX" model silencers
Low Pressure Drop silencers
Axial Cone silencers | QueensU Library
Cape Breton Hospital
Man. Cogeneration Plant
Semiconductor Facility
Read more |
9. Insufficient duct length | 
Fan silencers
Short silencers
Acoustical Louvers | Texas Power Station
Pickering Community Center
UofT Power Plant
NASA Clean Room
Goderich Ventilation Shaft
Motorola Semiconductor Facility
Fan silencers SS10
Short silencers SS13
Acoustical Louvers SS14
Read more |
10. Acoustical duct lining | 
All silencers | IBM HQ Office Building
Sunnybrook Health Science Center
Green Timbers School
CBC Headquarters
Read more |
11. Exposed glass fiber ducts | 
Film Lined silencers
No-Media silencers
IAQ silencers | Bruce Peninsula Health Care
Motorola Semiconductor Facility
Cape Breton Hospital
Motorola Semiconductor Facility 2
Film Lined silencers SS2
No-Media silencers SS3
IAQ silencers SS15
Read more |
12. Unreliable ratings | 
NVLAP Lab Code: 100424-0
All Vibro-Acoustics’ silencers | Litton Systems Clean Room
Ajax-Pickering Hospital
Kellogg's Manufacturing
Wyeth-Lederle Vaccines
National Arts Center
Read more |
13. Unacceptable installed performance | All silencers: mock-up testing | Waterpark Office Building
Metropolitan Life Building
Motorola Semiconductor Facility
Lietrim Computer Center
CBC Headquarters
Toronto Skydome
Hawaii NC-20 Studio
Plenum silencers SS12
Short Silencers SS13
Acoustical Louvers SS14
Read more |
14. Environmental noise | 
Plenum silencers
Short silencers
Acoustical Louvers | Ajax-Pickering Hospital
Niagara Casino
Goderich Ventilation Shaft
403/421 Bloor Office Building
Guggenheim Storage Building
York Admin Center
Plenum silencers SS12
Short silencers SS13
Acoustical Louvers SS14
Read more |
15. Severe environmental conditions | All silencers: mock-up testing | Texas Power Station
Niagara Casino
Manchester Cogeneration Plant
Goderich Ventilation Shaft
Kellogg's Manufacturing
Armstrong Manufacturing Plant
William Davis Computer Center
Wyeth-Lederle Vaccines
Read more |
16. Very small equipment rooms | 
All silencers: mock-up testing | Pathology Building, NU
Wyeth-Lederle Vaccines
BCE Place
Shipp Center
Read more |
17. Fans in occupied space | 
All silencers: mock-up testing | Niagara Courthouse Theater
Read more |
18. Ultra critical sound criteria | All silencers: mock-up testing | Roy Thompson Hall
National Arts Center
Read more |
