Room Criterion Reference

Distinguish RC-family ratings and diagnostic descriptors without reproducing proprietary or edition-specific tables.

Description

Room Criterion methods evaluate octave-band background sound and diagnostic spectral character.

Room Criterion methods evaluate octave-band background sound and diagnostic spectral character. RC, NC and NCB are separate rating procedures.^[1]

Distinguish RC-family ratings and diagnostic descriptors without reproducing proprietary or edition-specific tables.

When to use Room Criterion Reference

Use this tool to distinguish RC-family ratings and diagnostic descriptors without reproducing proprietary or edition-specific tables.

Choose a supported reference topic, run an input-free reference with an empty object, or prepare the measured values and caller-supplied test records requested. Keep acoustic metrics, frequency, units and test conditions consistent.

How to use Room Criterion Reference and understand its results

Choose a supported reference topic, run an input-free reference with an empty object, or prepare the measured values and caller-supplied test records requested. Keep acoustic metrics, frequency, units and test conditions consistent.
Enter topic using the field table and calculation rules, then run the tool.
Read source, statement, topic. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
topic	Reference topic to return.	string; one of "rating", "quality", "caution"	Required

Choose an exact topic enum from the input table and run the lookup. The implementation selects a fixed local entry and returns source, statement and the selected topic. Matching is case-sensitive without trimming or free-text search.

result=stored entry for selected topic

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
source	Source used for the reference statement.	string
statement	Narrow reference statement for the selected topic.	string
topic	Selected reference topic.	string; one of "rating", "quality", "caution"

json

{
  "input": {
    "topic": "rating"
  },
  "output": {
    "source": "ASHRAE Handbook—HVAC Applications",
    "statement": "Room Criterion methods evaluate octave-band HVAC background sound and assign a numerical criterion near the speech-frequency average.",
    "topic": "rating"
  }
}

Limitations and assumptions

No spectrum, criterion number or edition-specific compliance calculation is supplied. The source is a stored bibliographic label, not a fetched document; statements are not refreshed at runtime.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Space Noise Criteria Reference: Return room-noise criterion selection cautions for occupied spaces. For a complementary task, use Practice-Room Noise Target Screen: Compare a measured room-criterion value with an explicit caller target while preserving the caller’s instrument-family label.

References

Room Criterion Reference — tool.io

Similar or alternative tools

Space Noise Criteria Reference
Return room-noise criterion selection cautions for occupied spaces.
Practice-Room Noise Target Screen
Compare a measured room-criterion value with an explicit caller target while preserving the caller’s instrument-family label.