Gas flues should be led from cleaning holes to chimneys exits or pots accordingly with technical documentation. Cleaning holes should be situated 0,4m below flue entry.
Heating gas devices, such as: boilers, tankless water heaters, regardless heat loads, should be connected with separate gas channels accordingly to the installation instruction.
Gas flues and channels discharging gases by natural draught should have cross-sections based on calculations. They should also provide draught pressure appropriate to the device type and power.
Inner surface of flues discharging wet exhausts should be resistant to their destroying effect.
Common air-gas flues are acceptable to operate with devices with closed combustion chamber and equipped with protection against draught fading.
It’s acceptable to use separate air and gas channels as a set discharging gases and providing the device with air.
In a boilerhouse it’s acceptable to connect a few boilers into a common gas channel when:
boilers take air for combustion process from the room, provided that box spoil draught is used or the boilers are equipped with detectors turning them off in case of draught spoil,
gas flue is made for boilers with fun burners and its cross-section isn`t lower than 1,6 of sum of cross-sections of flues discharging gas form individual boilers, provided that the flue exit is equipped with a detector of draught spoil and can turn all the boilers off at once.
Gas flues and channels discharging exhausts from gas devices should be adjusted to the operating conditions of the device.
Gas flues and channels discharging exhausts from gas devices, except boilers, should meet following requirements:
cross-sections of gas flue and channel should be the same at all length,
vertical gas channels shouldn’t be shorter than 0,22m, horizontal laid with a slope of at least 5% in the direction of the device shouldn’t be longer than 2 m,
gas flue – measured from the axis of entry to the edge of exit – shouldn’t be shorter than 2m,
exits of gas channels, if required by operating conditions of a device, should be equipped with ventilators chosen accordingly to the amount of gas, length of vertical segments, location in wind area and local conditions.