Lec 9 - Table 1. Total Per-head Ventilation Rates for...

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Table 1. Total Per-head Ventilation Rates for Confinement Swine Building During Various Times of the Year. Facility Cold Weather (cfm) Mild Weather (cfm) Hot Weather (cfm) Sow and Litter 20 80 500 Pre-nursery pig (12-30 lbs.) 2 10 25 Nursery pig (30-75 lbs.) 3 15 35 Growing pig (75-150 lbs.) 7 24 75 Finishing hog (150-220 lbs.) 10 35 120 Gestation sow (325 lbs.) 12 40 150* Boar (400 lbs.) 14 50 180* * Use 300 per sow or boar in breeding facilities due to low animal density. Relative Humidity 50-80% is detrimental to airborne bacteria Moisture levels > 80% are conducive to survival of bacteria and spread of disease High Humidity contributes to rapid deterioration of equipment Calculating Ventilation Rate 24 Crate 22 * 60 ft. farrowing house Winter 20 CFM/crate 480 Mild 80 CFM/crate 1920 Summer 400 CFM/crate 9200 small 12 in. 200-1000 CFM medium 18 in. 300-3200 CFM large 24 in. 800-5000 CFM Air inlet, in 2 = CFM/4 60 ft. 720 in. long duct Duct Width, inches Winter .167 Mild .667 Summer 3.33
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Lec 9 - Table 1. Total Per-head Ventilation Rates for...

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