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Just because a DFE is under 7 kw does not mean it does not need added ventilation,all DFE's need ventilation unless otherwise stated by manufacturer and that ventilation shall be no smaller than 100cm2
Agree with you. British Standard 5871 part 3. All DFE fire installations require in a minimum 100cm2 free air ventilation unless the manufacturer for the appliance specifies otherwise. DFE fires less than 7kW may not require additional ventilation if the flue flow is greater than 70m3/h, manufacturer would have to be consulted before accepting this as acceptable.