hot air oven heats content in it and where as furnace heats air around it
Yes.
Hot air is blasted into the blast furnace to burn the coke (a cheap form of carbon) added to form carbon dioxide.
Hot air under pressure
A blast furnace is a forge in which ore is smelted to meal, being intensified by a blast of hot air.
Honeywell Furnace Filters are used in furnaces for improving indoor air quality. A hot furnace dries out the air and a filter keeps out the dust and grime from entering the house through the furnace.
a hot-air heating system
the blast furnace got its name , because its bottom which is called a furnace blows hot air to go up.
pass the air one place to another place ,hot year or coll air
Depends on where you get the hot air from. Returning hot air means the furnace will have to work less to heat that air back inåt output temperature. OTOH the energy to create that hot air has to come from somewhere. Using a space heater or something to blow into the return ducts will cost you more in electricity than what you save on the furnace .
the air being heated from a fireplace,air from a furnace,boiling water,the air being heated in a hot air balloon.
No, furnaces are forced air heat. Boilers are hot water heat.