These are the machines most of us have seen at various facilities or at mobile events from time to time. Many of us have either heard or witnessed that on occasion these machines can produce a slightly burnt odor, which is caused by poor maintenance. If used properly these machines are meant to be cleaned periodically which should result in trouble free operation.

• Pros: Cheap and inexpensive to use, you can virtually press the trigger and fill a room quite quickly
• Cons: Can cause odor from time to time in addition to being very loud when operating