When sourcing a roller kiln, you must prioritize thermal efficiency and structural stability. Key specs include the effective inner width (typically 2500mm to 3850mm for modern lines), maximum firing temperature (usually up to 1250°C for porcelain), and the roller material grade (high-alumina or silicon carbide rollers are essential for high-temperature zones). Ensure the kiln features high-density ceramic fiber insulation to minimize heat loss and a precision frequency conversion system for stable roller transmission.