Red Heart Frame Grade
Provides the user with sound birch boards with nice colour changes.Both black and sound knots are allowed, as well as red heart on both faces. Still the knot structure and number of the knots vary from knotty to knot free boards. Especcially suitable for sofa frames production.
Very big knots, mould, rot, undersize, cupping, bowing and twistings of the boards are not allowed.
Available dimensions 25/32 x 75/100/125/150 x 1800-3000mm with 300mm steps.