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Calcimator

Dairy Facility Ventilation

Calculate required ventilation CFM for dairy barns based on barn dimensions, cow count, and target air exchanges per hour.

Inputs

ft
ft
ft
/hour

Results

Required Ventilation

140,000 CFM

CFM per Cow

700 CFM

Barn Volume560,000 cu ft
Winter Minimum CFM3,000 CFM
Summer Maximum CFM200,000 CFM
48" Fans Needed (est.)8
Floor Area per Cow200 sq ft
Est. Monthly Energy Use10,228 kWh
How to Use This Calculator
  1. Enter barn dimensions (length, width, sidewall height) and cow count.
  2. Set the target air exchanges per hour for the season.
  3. Input fan diameter and individual fan CFM rating.
  4. Review total required CFM, number of fans needed, and estimated ventilation operating cost.
  5. Verify CFM per cow meets the minimum for your climate zone and housing type.
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