This standard provides guidelines for the design, construction, installation, and performance testing of compartment-type timber seasoning kilns with cross-forced air circulation. It covers aspects like kiln structure, air circulation systems, heating methods, and control instruments to ensure efficient and uniform drying of timber.
Guidelines for design, installation and testing of timber seasoning kilns (Compartment type with cross-forced air circulation)
Quick Reference Values
Recommended air velocity through timber stack1 to 2 m/s
Maximum operating temperature for general purpose kilns80 °C
Recommended spacing between timber layers (stickers)20 to 25 mm
Minimum clearance from walls for timber stack450 mm
Minimum clearance between roof and top of stack250 mm
Practical Notes
Ensure uniform airflow across the entire timber stack to prevent uneven drying, which can cause defects like case-hardening or warping.
Proper sealing of the kiln chamber, including doors and vents, is critical to maintain temperature and humidity control and improve energy efficiency.
The kiln's internal surfaces and metal components must be protected against corrosion from wood acids and high humidity, typically using specialized coatings like bituminous aluminium paint.