The integral unit compressors are noisy ! If you need quietness you should be looking at the Ultra quiet one like they use in dental surgeries like this one https://www.machinemart.co.uk/p/quiet-run-compressor-5/ (but I wouldn't buy a Clarke), but they are generally fairly low output unless you get the more expensive multiple units. If you want to go quiet and high volume you need a screw compressor http://thecompressorstore.co.uk/prod...FVhXDQodk7QASA (loadsa money!!)