If you smell ammonia or see condensation on walls and windows of the rabbit house, you have a problem. The purpose of ventilation is to remove heat during the summer and moisture during the winter. Rabbits require excellent ventilation to be productive and stay healthy. There needs to be a good circulation of fresh air throughout the rabbitry. Strong drafts should be avoided.
Natural ventilation is more economical.
In some areas, an open sided building with role-up curtains works well. With natural ventilation, only one tier of cages is recommended and a narrow building is preferred to a wide one. Sanitation Poor sanitation is another common cause of disease in the rabbitry. Manure or other waste materials should not be allowed to build up and accumulate in cages. Cages should be cleaned at least once a week.