| | | Air inlet aeration hole 0 12cm, minimum surface 100 cm2 | | Air inlet aeration holes 0 12cm, total surface 200 cm 2 | | |
| | | The quantitiy of air that enters the kitchen must be at least equal to the air used for normal gas combustion. In addition to this, one must consider that without a flow of air from outdoors, hood extraction may generate a drop in pressure that would prevent the complete expulsion of fumes. To avoid | | these two problems the air flow must come in directly through permanent openings on the outside walls of the kitchen. These openings are governed by the UNI7129 standards and must comply with the following requirements: - they must have a net cross-section of at least 6cm for each | | kW of heat capacity installed, with a minimum of IcCcm ; - if the hob does not have a thermocouple (device that stops the gas flow if the flame goes out) an additional hole is required to obtain a minimum aeration cross-section of 2CCcm. It is advisable for the second hole to be at the top of the ki- | | tchen wall to solve problems connected with the use 2of LPG which, as well as needing a greater quantity of air for combustion, has a relatively lower density compared to natural gas. | | |