College of Agriculture > NPTC

NPTC Min Vent Calculator

ENTER the total CFM capacity of the fans you will be running on timer for minimum ventilation:
total CFM's

ENTER your best estimate of the number of birds in the house:
Birds

Choose the age of the flock
Wk 1 (1-7 Days) .10 CFM/Bird Wk 2 (8-14 Days) .25 CFM/Bird Wk 3 (15-21 Days) .35 CFM/Bird Wk 4 (22-28 Days) .50 CFM/Bird Wk 5 (29-35 Days) .65 CFM/Bird Wk 6 (36-42 Days) .70 CFM/Bird Wk 7 (43-49 Days) .80 CFM/Bird Wk 8 (50-56 Days) .90 CFM/Bird

High ammonia (adds 15 seconds)
High moisture (adds 15 seconds)
High dust (subtracts 15 seconds)

Your 5 minute timer should be set for seconds ON-time.

The output run times from this calculator are for estimation purposes only and must be used with caution and good judgment. Growers should consult with their integrator before using this calculator to set minimum ventilation rates. Please forward questions, comments or problems to campbj1@auburn.edu

Last Updated: November 12, 2013