Division 1.2.1 The technical instructions intended for the installer must contain all the instructions for installation, adjustment and servicing required to ensure that those operations are correctly performed and that the appliance may be used safely. In particular, the instructions must specify:

the type of gas used,

the gas supply pressure used,

the flow of fresh air required:

• for the combustion air supply,

• to avoid the formation of dangerous unburned gas mixtures for appliances not fitted with the device referred to in point 3.2.3,

the conditions for the dispersal of combustion products,

for forced draught burners and heating bodies intended to be equipped with such burners, their characteristics, the requirements for assembly, to assist compliance with the essential requirements applicable to finished appliances and, where appropriate, the list of combinations recommended by the manufacturer.