Fans are an optional accessory for SlumberPod and using without a fan does not impact safety. Get more details here. 

Need a little more airflow? SlumberPod now has a special zipper pouch to accommodate the SlumberPod fan. 

• SlumberPod Fan
  Includes designed box, multi-speed, lightweight USB fan with an 8-foot cord (US electrical plug included). Passes all juvenile product safety tests and designed with child safety in mind. SlumberPod Fan can be used by itself, with the newest version of SlumberPod, or with SlumberPod Classic using the conversion kit (see below).