Actually that is the brand name of the vent fans in the ceiling of our rv. Fan-Tastic fans are the standard by which all other fans are judged.
For my non rv readers I will explain their use. They work the way "attic fans" work in an ordinary home. All rvs have a vent fan in the bathroom to pull the steam from the shower.
Most are just a small single speed fan in the 14"x14" opening the will not do a great job. The vent is cranked open and the fan automatically starts turning.
Our Fan-Tastic vent fan in the bathroom is full size to the opening and has 3 speeds plus "off". Select any of the 3 speeds and open the vent and the fan starts or you can place the switch to off and open it without the fan running (more on that later).
All controls are manual. I can reach them but the short one of the family has to use a pair of kitchen tongs to open it by placing the tongs on the black star shaped knob and turning it.
We ordered an automatic fan for the kitchen vent (the stove also has a vent-a-hood). It has a "rain sensor" that will automatically close it if it rains and it will reopen when the sensor dries.
This fan is controlled thermostatically by this wall unit (it can also be manually operated). In "auto" mode you can set the desired "temp and humidity" and the fan will open and run on high until it is reached. In "manual" mode the fan opens and runs on low until you choose to turn it off.
When using the kitchen fan, you can open a window or a door to receive a nice breeze. When the awning is out you can draw in the cool breeze it creates. Also you can just open the bathroom vent with the fan turned off to receive a breeze if you want to keep the doors and windows closed.
These are 12volt fans so they can be used (rvs have 12 batteries attached) even when you are not hooked to regular 120 volt power.
These fans are very powerful and really move a lot of air inside a rv. Roughing it in an rv with the comforts of a attic fan.