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135. All new buildings should be designed by a competent person who is well versed in animal welfare requirements. The buildings should provide adequate ventilation (throughout the year) for the type, size and number of stock to be housed (paragraph 114).
136. Where ventilation in existing buildings is inadequate, buildings should be modified by improving inlets and/or outlets and, if necessary, by making more radical changes to air movements, such as cutting slots in the roof (paragraph 115).