Fan airflow calculator

Open Fan airflow calculator on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "fan-airflow-calculator",
  "category": "calculators",
  "built": true,
  "requirements": "Room sides up to 1,000 m, with the room volume (entered, or length × width × height) up to 1,000,000 m³; targets above 0 and up to 1,000 air changes per hour, or 0.06 to 100,000 minutes per change; fan rating up to 100 m³/s. Calculated on your device; download a JSON report and a CSV of results.",
  "implementation": {
    "fields": [
      {
        "key": "roomMode",
        "label": "Room size from",
        "value": "Room dimensions",
        "type": "select",
        "values": [
          "Room dimensions",
          "Known volume"
        ]
      },
      {
        "key": "dimensionUnit",
        "label": "Dimension unit",
        "value": "m",
        "type": "select",
        "values": [
          "m",
          "cm",
          "ft",
          "in"
        ],
        "showWhen": {
          "roomMode": [
            "Room dimensions"
          ]
        }
      },
      {
        "key": "length",
        "label": "Room length",
        "value": 4,
        "type": "number",
        "min": 0,
        "step": "any",
        "showWhen": {
          "roomMode": [
            "Room dimensions"
          ]
        }
      },
      {
        "key": "width",
        "label": "Room width",
        "value": 3,
        "type": "number",
        "min": 0,
        "step": "any",
        "showWhen": {
          "roomMode": [
            "Room dimensions"
          ]
        }
      },
      {
        "key": "height",
        "label": "Ceiling height",
        "value": 2.5,
        "type": "number",
        "min": 0,
        "step": "any",
        "showWhen": {
          "roomMode": [
            "Room dimensions"
          ]
        }
      },
      {
        "key": "volumeUnit",
        "label": "Volume unit",
        "value": "m³",
        "type": "select",
        "values": [
          "m³",
          "ft³",
          "L"
        ],
        "showWhen": {
          "roomMode": [
            "Known volume"
          ]
        }
      },
      {
        "key": "volume",
        "label": "Room volume",
        "value": 30,
        "type": "number",
        "min": 0,
        "step": "any",
        "showWhen": {
          "roomMode": [
            "Known volume"
          ]
        }
      },
      {
        "key": "targetMode",
        "label": "Target",
        "value": "Air changes per hour",
        "type": "select",
        "values": [
          "Air changes per hour",
          "Turnover time"
        ]
      },
      {
        "key": "ach",
        "label": "Air changes per hour",
        "value": 6,
        "type": "number",
        "min": 0,
        "max": 1000,
        "step": "any",
        "help": "Your target, for example from a product guide or local guidance.",
        "showWhen": {
          "targetMode": [
            "Air changes per hour"
          ]
        }
      },
      {
        "key": "turnover",
        "label": "Minutes for one full air change",
        "value": 10,
        "type": "number",
        "min": 0.06,
        "max": 100000,
        "step": "any",
        "showWhen": {
          "targetMode": [
            "Turnover time"
          ]
        }
      },
      {
        "key": "fanUnit",
        "label": "Fan rating unit",
        "value": "CFM",
        "type": "select",
        "values": [
          "CFM",
          "m³/h",
          "L/s"
        ]
      },
      {
        "key": "fanRating",
        "label": "Rated airflow of one fan (optional)",
        "value": 50,
        "type": "number",
        "min": 0,
        "step": "any",
        "help": "Leave empty to skip the fan count.",
        "required": false
      }
    ],
    "registrationFamily": "measured-quantity-form-reference",
    "input": false,
    "live": true,
    "presentation": "metrics",
    "note": "Calculated on your device for rooms up to 1,000,000 m³ and targets up to 1,000 air changes per hour. You choose the target; no ventilation rate is recommended.",
    "experience": {
      "automatic": true,
      "single": true,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Room and target",
      "placeholder": "Use the fields below",
      "help": "This calculator uses the room and target fields only. Results update as you type. Up to 1,000,000 characters.",
      "helpParts": [
        "This calculator uses the room and target fields only.",
        "Results update as you type.",
        "Up to 1,000,000 characters."
      ],
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

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