acoustic hood

The printer is noisy and should be fitted with an acoustic hood, or replaced by a quieter machine.

An acoustic hood for the printer is needed (or printer replaced by a quieter type).

Are daisy-wheel printers shielded under acoustic hoods, or left to clatter away on desks every time someone prints a document?

Readers wishing to use lap-top computers are increasing in number, and to accommodate those whose machines are not totally silent, acoustic hoods have been provided.

An example of computer equipment which falls into the "functional" exception (i.e. the first part of the exception) is a soundproof box for a printer (acoustic hood).