Designed to fit the item# 701194 Still-Air Picture Window Incubator. Simple design allows for reliable, low-cost, trouble-free use. Eliminates worry about weekend turning and loss of heat by opening incubator to turn eggs. Holds 42 chicken eggs; 6 extra racks are included for holding 120 quail eggs. Wt, 5 lb. 110-V AC. Unit must be used in conjunction with a Turbofan (item# 701191B).