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Questions and Answers
What material is recommended for sound attenuation in supply and return plenums?
What material is recommended for sound attenuation in supply and return plenums?
- Flexible connector
- Metal duct liner
- Ductboard (correct)
- Uninsulated ductwork
What should be included in supply duct to reduce air noise?
What should be included in supply duct to reduce air noise?
- No elbow
- Two 45° elbows
- Three 30° elbows
- One 90° elbow (correct)
What should be done if existing ducting is too small?
What should be done if existing ducting is too small?
- Use variable capacity and air flow duct and register sizing
- Connect the unit anyway
- Change the blower speed
- Install larger ductwork (correct)
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Study Notes
- Duct system should be sized to handle design airflow quietly
- Flexible connector recommended for duct connections to eliminate vibration transfer
- Supply and return plenums should have fiberglass duct liner or be constructed from ductboard for sound attenuation
- Application to uninsulated ductwork in unconditioned space is not recommended
- At least one 90° elbow should be included in supply duct to reduce air noise
- Blower speed can be changed to address air noise or excessive air flow
- Check existing ductwork capacity before connecting unit
- Larger ductwork should be installed if existing ducting is too small
- Check for leaks and repair existing ductwork
- Variable capacity and air flow duct and register sizing is crucial for proper air delivery and sound levels.
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