Do I need a fire exit in a room containing printers in the UK?  The
size of the room is 15 feet x 6 feet and will contain 5 printers.

some guidance below - it's hard to say exactly what applies in your
case as the rules depend on building use.  The values 18m and 110cm
values I've heard before for places of employment.

"means of escape" is the usual jargon so it's worth searching for that.

http://www.derbyshire-fire-service.co.uk/pdf/Licensing_Guide_for_Applicants_V4_23_Aug_05.pdf

see also places found with "fire prevention" "free advice"
such as
http://www.firesafe.org.uk/

It's practically certain you have one exit already - I assume you are
asking about an additional one!

Bieng in the fire protection industry the room size is to small to put
in anothr exit anyway. The only thing you need is the right type of
extinguisher for your application. I am assuming that you would need
at least one ABC extinguisher which is rated for papr fires. If you
want to protect it more you can try Halon or C02. Hope this helps