Gratus 22500 BTU Duct Air Conditioner T3 & T4 SD25TRAC4 - This 22500 BTU duct air conditioner is designed for large spaces. T3/T4 compatibility ensures stable operation up to 60°C. Self-adaption technology optimizes airflow and reduces noise automatically. Multiple protection systems ensure safe and long-lasting performance. Double anti-corrosion technology enhances durability in harsh environments.