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The Decibel Scale
Gives an approx of human perception of loudness. This is because the human ear has a logarithmic response to changes in sound level...more

Good Hearing?
A typical person with good hearing can hear from about 20Hz to 20kHz (the audio bandwidth). A person's voice will usually range from 500Hz to 2kHz...more
Part L2A
Conservation of fuel and power in new builds other than dwellings

Isle of Man - DEC - 0161 403 0129
The office that covers this area is: Manchester
The towns & cities that are covered within this county are:
Douglas, Peel,
Phone Number: 0161 403 0129 Email: isle-of-man@e2consultants.co.uk
Our other services include:
DEC can also be known as:
Display Energy Certificate,


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