... .well performance, erosion-resistance,dampproofness 2.great anti-tensile strength Fire Rolling Shutters Technical Parameter of Special-class fireproof ... fire without damage more than 3 hoursWind pressure resistance strength: 80 degree, 120 degreesMotor Power: 0.25kw-0 ... in fireproof character, erosion-resistance, dampproofness, great anti-tensile strength and anti-humid, it is with small volume, little ...