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HVAC Duct Equivalent Round Diameter Calculator
x402
HVAC Duct Equivalent Round Diameter Calculator is a paid API for AI agents from hvac-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates the equivalent round duct diameter for a rectangular duct (same friction loss), or finds the missing rectangular side that matches a given round duct diameter.
Price / call$0.02
Success—
StatusUnknown
How this service works
Equivalent round diameter of a rectangular duct (same friction), or the second side that matches a round duct.
Output
Returns the equivalent round diameter for the given rectangular duct dimensions (or the missing rectangular side), along with aspect ratio, rectangular cross-sectional area, round cross-sectional area, and a text summary. May include a disclaimer and degraded/error flags.
Example use cases
Rectangular to round duct conversion
“I have a 24 by 12 inch rectangular duct and I need to know what diameter round duct would give me the same friction loss — can you calculate the equivalent round diameter?”
Find matching rectangular duct side
“I've got a 14-inch round duct that I need to replace with a rectangular duct, and one side has to be 10 inches. What should the other side be to match the same friction?”
Duct sizing for HVAC retrofit
“We're replacing flex duct with rigid rectangular duct in a retrofit. The old round duct was 12 inches — if I use a 16-inch wide rectangular duct, what height do I need to match it?”
Technical details
Endpoint
GEThttps://hvac-calc.x402tookit.com/duct-equivalent?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to size round or rectangular HVAC ducts to have equivalent friction loss — particularly when retrofitting between duct shapes, selecting fittings, or performing duct layout design. It is purpose-built for the HVAC equivalent round diameter formula, making it more reliable and accurate than a general-purpose calculator or LLM arithmetic.
Side effects
- Missing required sideA parameter returns an error
- If neither sideB nor roundDiameter is provided, the calculation cannot resolve both unknowns
- Non-numeric or negative input values may return validation errors
- Service may return a degraded flag if partial results are available
- Network or payment-related failures (402 payment required if USDC not provided)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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