90 minute fire rated wood doors is available in UL fire door range, except for it, 20/45/60 minutes fire doors are also available for different project requirements.
90 minute door has distinct difference with 20 minute door due to a completely different fire core. Some manufacturers are able to supply pure solid wood structure fire rated door with 20 minutes fire rating, while some other are supplying doors with fire rated particle board. Both structures possess excellent fireproof capacity but solid wood structure usually requires a higher cost.
When we walk in a high building, which is more than 7 levels, we may find high level fire rated wood doors at the entrance of each unit. This is to make sure the door will stand and keep the fire outside room before fire fighting arrives.
Nowadays a 90 minute fire rated wood door will be also very nice with different surface treatment. The most common option is flush with white primer finish which is ready to accept paint at site to match color of whole project. Sometimes HPL(high pressure laminated) and stained veneer are also required in some hotel and office building.