Factory Air Exchange & Ventilation

Calculate required ventilation airflow (CFM or m³/hr) based on building volume and required Air Changes per Hour (ACH).

OPERATING LIMITS — Air-change arithmetic only, not contaminant, heat, capture or hazardous-area ventilation design.

INPUT DESIGN PARAMETERS (SI)

Building Length[m]

Building Width[m]

Building Height[m]

Required ACH[changes/hr]

changes/hr

CALCULATED SPECIFICATION OUTPUT

Required Airflow

90000 m³/h

Internal Volume

15000 m³

Related planning checklists

This calculator appears in the following engineering planning checklists:

Industrial Cooling Sizing Pipeline

HVAC Engineer

1. Factory Air Exchange & Ventilation2. Industrial Chilled Water Cooling Capacity (HVAC)3. Cooling Tower Makeup & Blowdown

HVAC Airflow, Duct & Fan Sizing Check

HVAC Engineer

1. Factory Air Exchange & Ventilation2. Duct Diameter from Airflow & Velocity3. Fan Power from Airflow & Static Pressure4. Airflow Sensible Cooling Load

Technical Methodology & Engineering Principles

GOVERNING EQUATION

Room volume = length × width × height; airflow = room volume × air changes per hour, divided by 60 for CFM in US units.

Assumptions & Scope

Well-mixed dilution ventilation at a user-selected ACH. Contaminant generation, capture velocity, make-up air, pressure balance, heat load, duct resistance, and code-required exhaust are excluded.

Operating Range & Boundary

Dimensions and ACH must be positive.

Peer Reference: ASHRAE Handbook—HVAC Applications and ACGIH Industrial Ventilation; determine required ventilation from the actual hazard and applicable code.