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Murray Jones asks about the required sizes of kitchen extract fans. His question has been answered by Vent-Axia (Theme - HVAC):
Question: In a kitchen of area 5.2m2, is it acceptable to install a four inch extract fan instead of a six inch one.
Also, do such fans have to be humidistat operated by regulation?
Finally, where can I find figures for the correct extract volumes etc.?
Answer: You could only use a four inch fan if it was continuously running - this could be something like our own Lo Carbon Centra.
The figures for the extract rates can be found in Building Regulations Approved Document F.
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