▁differences ▁to ▁drive ▁air ▁flow . ▁However , ▁the ▁technical ▁definition ▁of ▁con ve ction ▁does ▁not ▁specify ▁how ▁the ▁liquid ▁motion ▁is ▁driven , ▁so ▁the ▁term ▁does ▁properly ▁apply ▁to ▁these ▁devices . ▁ ▁C ul inary ▁con ve ction ▁o vens ▁Con ve ction ▁o vens ▁dist ribute ▁heat ▁even ly ▁around ▁the ▁food , ▁removing ▁the ▁blank et ▁of ▁cool er ▁air ▁that ▁surr ounds ▁food ▁when ▁it ▁is ▁first ▁placed ▁in ▁an ▁o ven ▁and ▁allowing ▁food ▁to ▁cook ▁more ▁even ly ▁in ▁less ▁time ▁and ▁at ▁a ▁lower ▁temperature ▁than ▁in ▁a ▁conventional ▁o ven . ▁ ▁History ▁▁ ▁The ▁first ▁o ven ▁with ▁a ▁fan ▁to ▁circul ate ▁air ▁was ▁invent ed ▁in ▁ 1 9 1 4 ▁but ▁never ▁launched ▁commer cially . ▁ ▁The ▁first ▁con ve ction ▁o ven ▁in ▁wide ▁use ▁was ▁the ▁Max son ▁Wh irl wind ▁O ven , ▁invent ed ▁in ▁ 1 9 4 5 . ▁ ▁Design ▁▁ ▁A ▁con ve ction ▁o ven ▁has ▁a ▁fan ▁with ▁a ▁he ating ▁element ▁around ▁it . ▁A ▁small ▁fan ▁circul ates ▁the ▁air ▁in ▁the ▁cook ing ▁chamber . ▁ ▁Con ve ction ▁o vens ▁may ▁include ▁radi ant ▁heat ▁sources ▁at ▁the ▁top ▁and ▁bottom ▁of ▁the ▁o ven , ▁which ▁impro ves ▁heat ▁transfer ▁and ▁spe eds ▁cook ing ▁from ▁initial ▁cold ▁start . ▁On ▁the ▁other ▁hand , ▁some ▁o vens ▁have ▁all ▁the ▁he ating ▁elements ▁placed ▁in ▁an ▁outside ▁en closure ▁and ▁hidden