Patent ID: 7692119

Claim:
A reflow furnace heating a printed circuit board carried by a carrier device, the furnace comprising: a circulation fan to circulate an ambient gas; a heater to heat the ambient gas; a plurality of blowing ports having a prescribed total area to blow the ambient gas heated by the heater to a printed circuit board; and a plurality of suction ports having a prescribed total area to suck the ambient gas, a ratio of the total area of the suction ports to the total area of the blowing ports being within a range from 3.0 to 6.0, wherein said plurality of blowing ports and said plurality of suction ports are arranged on a panel such that said plurality of blowing ports are arranged along a seal line along outer edges of said panel perpendicular to a carrying direction of the printed circuit board, said plurality of suction ports are arranged along a first suction exclusive line on an inside of said seal line in each outer edge of said panel perpendicular to the carrying direction of the printed circuit board, and said plurality of blowing ports and said plurality of suction ports are alternately arranged in a mixed region inside of each of said first suction exclusive lines.