WL (Working Low) | | spaces used for working, business, or storage—low fire load1 | | places for manufacturing, processing, or storage of non-combustible materials or materials having a slow heat release rate, cool stores, covered cattle yards, wineries, places for grading, storage, or packing of horticultural products, places for wet meat processing, banks, hairdressing shops, beauty parlours, places for provision of personal or professional services, dental offices, laundries (self-service), medical offices, business or other offices, Police stations (without detention quarters), radio stations, television studios (no audience), places for small tool and appliance rental and service, telephone exchanges, places for dry meat processing |
WM (Working Medium) | | spaces used for working, business, or storage—medium fire load1 and slow, medium, or fast fire growth rates | | places for manufacturing and processing of combustible materials not listed in the rows relating to WL, WH, or WF, including bulk storage up to 3 m high (excluding foamed plastics)2 |
WH (Working High) | | spaces used for working, business, or storage—high fire load1 and slow, medium, or fast fire growth rates | | chemical manufacturing or processing plants, distilleries, feed mills, flour mills, lacquer factories, mattress factories, rubber processing plants, spray painting operations, places for plastics manufacturing, or bulk storage of combustible materials over 3 m high (excluding foamed plastics)2 |
WF (Working Fast) | | spaces used for working, business, or storage—medium or high fire load1 and ultra fast fire growth rates | | areas involving significant quantities of highly combustible and flammable or explosive materials which because of their inherent characteristics constitute a special fire hazard, including bulk plants for flammable liquids or gases, bulk storage warehouses for flammable substances, and places for bulk storage of foamed plastics2 |