Sometimes Class E airspace goes all the way down to the surface of the ground. This is called Class E surface area.
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The answer lies within the faded magenta circle that typically surrounds nontowered airports. In the example above, the floor of Class E is 700' on the faded side of the border (the airport surface area) and 1,200' everywhere else.
There are Class E airspace areas that extend upward from a specified altitude to, but not including, 18,000 feet MSL and are designated as offshore airspace areas.
Class E airspace: Transponder requirements vary depending on the altitude of the aircraft: Below 10,000 feet MSL (mean sea level): A transponder is not required unless the aircraft is within 30 nautical miles of a Class B airport.
Upper Class E airspace operations refer to those that take place over 60,000 feet above mean sea level (MSL) in the National Airspace System (NAS). Operations in upper Class E airspace have historically been limited due to the challenges faced by conventional fixed wing aircraft in reduced atmospheric density.
In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.
Class E airspace has no requirements for communication when flying VFR. You only have to maintain two-way communication in Class E airspace when flying IFR.
Class E Airspace, indicated by the faded magenta line. Most of the airspace in The United States is Class E airspace. Class E airspace extends from 1,200 feet AGL to 17,999 feet MSL (18,000 feet is the floor of Class A airspace). Class E airspace can also extends down to the surface or 700 feet AGL.
250 knots below 10,000' MSL within class echo airspace. While operating in the traffic pattern at an airport without an operating control tower, it is recommended that the pilot maintain an airspeed of no more than 200 KIAS.
In short, the real purpose of Class F is to allow flights to remain IFR in uncontrolled environments. Since this is a sort of mix between Class E and Class G airspace, there is no Class F inside the United States.
In the United States, the Federal Aviation Administration (FAA) has the sole authority to regulate all navigable airspace exclusively determining the rules and requirements for its use.