When temperature goes up to 180℃ in fire, the intumescent core inside of door viewer will rapidly expand to filling the interspace to stop fire, smoke or gas through out.
• Material:Available in either brass or chrome finish
• Visual angle:100-130 degree
• Diameter:25mm
• FV25-1 suitable for 40-60mm thickness of fire door FV25-2 suitable for 60-80mm thickness of fire door FV25-3 suitable for 80-100mm thickness of fire door
• Back cover available
Since its establishment, our factory has been developing first world class products with adhering the principle
of quality first. Our products have gained excellent reputation in the industry and valuabletrusty among new and old customers..