This topic includes information related to special function doors installed during construction. Special function doors are installed where applications require specific desirable characteristics. Door types include; cold storage doors, hangar doors, industrial doors, lightproof doors, darkroom doors, radio frequency interference shielding doors, radiation shielding doors and frames, neutron shielding doors and frames, security doors and frames, security gates, vault doors and day gates, detention doors and frames and sound control door assemblies.