General Guidance - Noise from equipment should be at a level that does not impair concentration or prevent normal conversation. Common examples of potentially intrusive equipment are printers, photocopiers, facsimile or telephone answering machines. Heat can be given off by electrical equipment and if not property maintained, printers and photocopiers can give off ozone. Ventilation and humidity should be maintained at a level which prevents discomfort and sore eyes. relocation of equipment, screening or soundproofing can all be used to reduce levels of interference.