To provide a gas table surroundings that does not influence a surrounding environment and is mild to cooking operation by making use of a new adjustment of a suction/ exhaustion system wherein there are solved the difficulties with a prior art ventilating fan that particularly permits invasion of a cold draft and exudation of combustion waste gas from and into a room, that comfortable environment around any housewife and old man are deteriorated and its bad affection can not be ignored, which is caused by pressure reduction by ventilation.

Once a pressure reduction portion formed by exhaustion is instantaneously replenished with suction air that is equal to the amount of exhaust, air inside and outside a gas table surroundings can be interrupted. More specifically, air for combustion and dilution, i.e., the total flow of suction air including air for a small-sized air curtain if necessary is injected at an air velocity without any trouble for cooking operation from a lower portion with a remaining fraction thereof being injected and branched from the neighbourhood of the range hood, and the total flow is fed to the pressure reduction portion. It is possible to further improve accuracy by introducing a fine pressure difference correction apparatus and synchronous driving of the same motor. This ensures high heat insulation and energy saving. Ventiolation is possible from a valve on an air suction cylinder shoulder as in the prior art. Comforableness of a room and harmful gas from a gas stove are prevented from going in and out to eliminate the affection of temperature and humidity.