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Can I vent a 110 CFM Panasonic bathroom exhaust fan through existing three-inch rigid ducting, or is building code strictly requiring four-inch duct for that airflow rate now?

ChatGPTgpt-62 queries11/1/2026
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Fan-out diagram

The searches the AI actually ran for this prompt.

SEED QUERY
Can I vent a 110 CFM Panasonic bathroom exhaust fan through existing three-inch rigid ducting, or is building code strictly requiring four-inch duct for that airflow rate now?
2 real searches · 1 real-search pass
Virginia 2021 Residential Code bathroom exhaust fan duct minimum 4 inch M1504.2 Leesburg VAGoogle ↗
OBSERVEDInstruction
Panasonic 110 CFM bathroom exhaust fan installation instructions 3 inch duct 4 inch duct airflowGoogle ↗
OBSERVEDInstruction

Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.

Query classes

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

ChatGPT real searches (2)
Short factOther / navigationalComparisonConsequenceReasonDefinitionInstruction100%Yes / no

Classes come from the query-classifier (a local Laya model).

Searches and sources

ChatGPT2 real searches · gpt-6
Virginia 2021 Residential Code bathroom exhaust fan duct minimum 4 inch M1504.2 Leesburg VA Google ↗
Panasonic 110 CFM bathroom exhaust fan installation instructions 3 inch duct 4 inch duct airflow Google ↗

Queries

2 queries · click a column to sort
Query / typeSearchIntentQuery classRouting formatClusterFreq ↓Weight
Virginia 2021 Residential Code bathroom exhaust fan duct minimum 4 inch M1504.2 Leesburg VA
OBSERVED
Google ↗
AI Mode ↗
—Instruction——1x
of 1
Panasonic 110 CFM bathroom exhaust fan installation instructions 3 inch duct 4 inch duct airflow
OBSERVED
Google ↗
AI Mode ↗
—Instruction——1x
of 1