Matching Jambs and CasingsDoorDesignLab door units are completed with jambs and casings, which are factory pre-finished to match the door slab in style and color. Solid coreWe use a technologically advanced insulating core that has a density of 12,5 lb/ft3.High density wood fiber core is mixedin with polyurethane resin and waxto yield in high level of sound and thermal insulation. RUBBER SEAL Energy saving: rubber seal helps to keep the warmth inside the room for a long time due to the…