Labels:monitor OCR: lass or -lass flame spr read rating {1 and smoke developed number of 450 Interior Type A An FRTW must remain at or below 280 moisture content when conditioned at 92% relative humidity and 80. F to be within hygroscopic limits. FR If an FRTW product has both flame spread and smoke developed number of and no significant progr essive com bustion in 30 minute test it shall bear this desi ignation. If the smoke developed number is higher both the flame spread and smoke developed number must be specifically stated on the wood and it loses the FR-S designation. Class Interio groscopic moke tatec
