Real ChatGPT answer · index seedBUSxXa60VvgcompleteHome services and improvement · HVACinformational

What are the best practices for internally lining sheet metal supply ducts near a noisy commercial rooftop unit to attenuate low frequency fan rumble without restricting airflow

ChatGPTgpt-61 query11/1/2026
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The searches the AI actually ran for this prompt.

SEED QUERY
What are the best practices for internally lining sheet metal supply ducts near a noisy commercial rooftop unit to attenuate low frequency fan rumble without restricting airflow
1 real search · 1 real-search pass
HVAC duct liner low frequency sound attenuation insertion loss pressure drop design ASHRAE SMACNA manufacturer guidanceGoogle ↗
OBSERVED

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Query classes

Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.

Classifying 1 queries…

Searches and sources

ChatGPT1 real searches · gpt-6
HVAC duct liner low frequency sound attenuation insertion loss pressure drop design ASHRAE SMACNA manufacturer guidance Google ↗
  1. CHAPTER 49. NOISE AND VIBRATION CONTROL · handbook.ashrae.org
  2. CHAPTER 8. SOUND AND VIBRATION · handbook.ashrae.org
  3. CHAPTER 48. NOISE AND VIBRATION CONTROL · handbook.ashrae.org
  4. Page 1 · smacna.org
  5. CHAPTER 49. NOISE AND VIBRATION CONTROL · handbook.ashrae.org

Queries

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Query / typeSearchIntentQuery classRouting formatClusterFreq ↓Weight
HVAC duct liner low frequency sound attenuation insertion loss pressure drop design ASHRAE SMACNA manufacturer guidance
OBSERVED
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