The fire viewer can quickly expand and foam the high expansion material installed in the core sleeve of the door mirror under the fire temperature (≥ 180 ℃), and block the peephole of the fire door in a very short time (generally ≤ 8 min), so as to prevent the fire spread, smoke and toxic gas overflow. This product has novel design, reasonable structure, optical lens group, wide viewing angle and beautiful appearance. The metal fittings used in the door mirror are chrome plated, which has anti-corrosion, anti-oxidation, stable performance, long service life and easy installation.
Fire viewer structure：The fire viewer is composed of a door lens jacket, a door lens core sleeve, a door mirror inner sleeve, an objective lens group and an eyepiece (the eyepiece is installed in the core sleeve), as shown in Figure 1. (in order not to affect the imaging effect of the door mirror, please do not disassemble and assemble the components of the door mirror at will, otherwise the optical effect will be affected.)
Visual range : 130-160 degrees
Product diameter : 25mm
Applicable fire door thickness : 14-25mm, 45-65mm, 60-80mm
Back cover options : silver, gold and bronze.