Math & Numbers

Ventilation Rate Calculator (People / Area / Contaminant)

Compute the required outdoor / supply ventilation rate. ASHRAE 62.1 ventilation-rate procedure: people component Vpz = Rp·P, area component Vaz = Ra·A, breathing-zone outdoor air Vbz = Vpz + Vaz, zone supply airflow Voz = Vbz / Ez. Three modes: ASHRAE 62.1 (people + area), per-person rate (P × Rp), or contaminant dilution (Q = G / (C_acc − C_sup), where G can be mg/s, mg/h, or L/s of gas and concentrations mg/m³ or ppm). Results reported in L/s, m³/h, and CFM.

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'http://127.0.0.1:3003/en/api/tools/ventilation-rate-calculator' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"ashrae","occupants":20,"rp":2.5,"rpUnit":"L/s-person","area":100,"areaUnit":"m2","ra":0.3,"raUnit":"L/s-m2","ez":1,"gGeneration":0,"gUnit":"L/s-gas","cAccept":0,"cSupply":0,"cUnit":"ppm","molarMass":44.01,"decimalPlaces":4}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST http://127.0.0.1:3003/en/api/tools/ventilation-rate-calculator

Parameters

Name	Type	Required	Description
mode	select	No	ASHRAE 62.1 (people + area), per-person rate, or contaminant dilution.
occupants	number	No	Number of occupants P. Used in 'ashrae' and 'perperson' modes.
rp	number	No	Outdoor air rate per person Rp, in the selected Per-person Rate Unit. Used in 'ashrae' and 'perperson' modes.
rpUnit	select	No	—
area	number	No

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-ventilation-rate-calculator": {
      "name": "ventilation-rate-calculator",
      "description": "Compute the required outdoor / supply ventilation rate. ASHRAE 62.1 ventilation-rate procedure: people component Vpz = Rp·P, area component Vaz = Ra·A, breathing-zone outdoor air Vbz = Vpz + Vaz, zone supply airflow Voz = Vbz / Ez. Three modes: ASHRAE 62.1 (people + area), per-person rate (P × Rp), or contaminant dilution (Q = G / (C_acc − C_sup), where G can be mg/s, mg/h, or L/s of gas and concentrations mg/m³ or ppm). Results reported in L/s, m³/h, and CFM.",
      "baseUrl": "http://127.0.0.1:3003/mcp/sse?toolId=ventilation-rate-calculator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "ventilation-rate-calculator",
    "arguments": {
  "mode": "ashrae",
  "occupants": 20,
  "rp": 2.5,
  "rpUnit": "L/s-person",
  "area": 100,
  "areaUnit": "m2",
  "ra": 0.3,
  "raUnit": "L/s-m2",
  "ez": 1,
  "gGeneration": 0,
  "gUnit": "L/s-gas",
  "cAccept": 0,
  "cSupply": 0,
  "cUnit": "ppm",
  "molarMass": 44.01,
  "decimalPlaces": 4
}
  }
}

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