All of the above. Very long fur. All of the above. Rabbits just love to breathe stale air. Circulated fresh air is very healthy for rabbits.
Rabbits hate fresh air with a passion.
It helps rabbits breed better and produce more litters. Sick rabbits and rabbits you have recently purchased. All the rabbits in your rabbitry. Secluded area for bucks and does when breeding. Give up on saving the litter of kits.