test 01

CP

Car Park Ventilation Calculator

A clean, responsive single-file tool — mass-balance based sizing, unit switching, and easy export.

Inputs

Single file • Vanilla JS

Unit System Metric (m, m³/s) Imperial (ft, CFM)

Switch units — length inputs will convert visually for convenience.

Design Safety Factor 1.00 — None 1.10 — 10% extra 1.20 — 20% extra 1.50 — 50% extra

Apply to final ventilation.

Length

m

Width

m

Clear Height

m

Number of Vehicles

Engine Running Fraction 5% — Mostly parked 10% — Typical 25% — High idling

CO Emission Rate (per running vehicle)

g/hr

Target Indoor CO

ppm

Outdoor CO

ppm

Air Changes per Hour (optional)

Notes / Project

Results

Metric • m³/s

Results are based on a steady-state mass-balance:

Floor Area

-

Volume

-

Estimated CO Generation

-

Required Ventilation

-

Equivalent (CFM)

-

Equivalent ACH

-

Design Safety Factor

-

Rounded Flow (m³/s)

-

Used Source

-

Assumption: Steady-state mass balance: G (g/hr) = K · ΔC (ppm) · Q (m³/s)

We use an engineering conversion factor K ≈ 1.164 g/hr per (ppm·m³/s) for CO at common conditions.

Built with vanilla JavaScript • Copy-paste ready