Fan affinity laws
Fan affinity laws: new airflow, pressure and power after a speed change (flow ~ N, pressure ~ N^2, power ~ N^3).
Answeringour last check, 2026-10-21
1 of 1checks answered this week
290 msmedian answer time
$0.02listed price per call
$0.02price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://hvac-calc.x402tookit.com/fan-laws
| Category | Everything else |
|---|---|
| Provider host | hvac-calc.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.02 | 290 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"cfm": 1000,
"power": 2,
"rpmFrom": 1000,
"rpmTo": 1200,
"staticPressureInWg": 1
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"cfm": {
"description": "Current airflow in CFM",
"type": "number"
},
"power": {
"description": "Current shaft power (hp or kW)",
"type": "number"
},
"rpmFrom": {
"description": "Current fan speed (rpm or hertz)",
"type": "number"
},
"rpmTo": {
"description": "New fan speed, same unit",
"type": "number"
},
"staticPressureInWg": {
"description": "Current static pressure in in. wg",
"type": "number"
}
},
"required": [
"rpmFrom",
"rpmTo"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"flowRatio": {
"type": [
"null",
"number"
]
},
"newCfm": {
"type": [
"null",
"number"
]
},
"newPower": {
"type": [
"null",
"number"
]
},
"newStaticPressureInWg": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"powerRatio": {
"type": [
"null",
"number"
]
},
"pressureRatio": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"speedRatio": {
"type": [
"null",
"number"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}