Fire door core assembly

摘要: A fire resistant wood door is formed from an opposing pair of rails interconnected by a upper and lower stiles forming outer frame. laminate core provided within the frame covered sheathing. The first second panels heat barrier layer. Each organic material with plurality grooves on one surface. layer in form casting applied to grooved surface at least one, preferably both, panels. are then joined together sandwiched therebetween. When sheathing, having rating ar 45 minutes.