This powerful 350,000 BTU indirect fired heater delivers clean, dry heat for construction sites and temporary heating applications. Featuring a stainless steel heat exchanger that separates combustion byproducts from the heated air, this unit provides 100% breathable, contaminant-free warmth. With 2,500 CFM airflow and ductable capabilities up to 50 feet, this heater efficiently distributes heat throughout large spaces. The integrated 42-gallon fuel tank provides up to 14 hours of continuous operation, minimizing refueling downtime. CSA certified for safety and reliability, this heater includes a high-limit safety switch and industrial-grade burner technology for consistent performance in demanding environments.