The fire rated doors of company has 3 certifications:FM,WHI,UL.the standard is American standard.
UL is the most authoritative,the head office is in US.because of anti-monopoly,UL has separated our someone and have set up WHI,the head office is in UK,the standard has UK and US.The FM is insurance business with fortune global 500.The head office is in US,the standard is the same to US standard.We have the three certifications for different fire doors.
UL FM 3hours steel fire door
WHI 1 hours wood fire door
