1948, 1949, 1950 and early 1951 Magic Air re-designed heater cores have a modern efficient heater core design that squeezes a core measuring 2-5/8" into the the housing.  The tube and fin design with its high density core can withstand the higher cooling system pressure of a modern engine. 

Some notes on the Ford Heaters in this period

• This 1948 - early 1951 Fresh Air - Magic Air has tubes with a 1-1/2" center-to-center
• There are many types of heaters in this period; Fresh Air, Ford Script, Fresh Air - Magic Air and a recirculating heater.
• The Fresh Air Hot Water heater used a Magic Air fan
• The recirculating heater did not use the air duct under the fender. It just uses the air in the cab, or as the name implies, recirculates the air.
• An accessory heater was also available and that was a recirculating heater also. It had 3 doors on the face and was from 1948-1950 F series trucks.
• There are different versions of the Magic Air e.g. 1948-1950, 1951 and 1952.
• The primary difference in 1951 and 1952 is the flapper door.
• The 1948-1950 had a triangular control bracket and the 1951-1952 had a straight control bracket. Both mounted under the bottom of the dash.

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