Abstract: A direct-fired heater suitable for connection to duct work is provided. The heater comprises a combustion chamber defined by a combustion chamber wall, a burner plate at one end proximate a fan blade and an exhaust plate at an opposite end, the burner plate having openings therein for allowing airflow into the combustion chamber and the exhaust plate have an opening therein for allowing exit of heated exhaust from the combustion chamber, the combustion chamber wall extending past the burner plate. A first airflow zone exists between the outer shell and the combustion chamber allowing airflow between the fan blade and the outlet in the outer shell. An injector for injecting gas into the combustion chamber in proximity to the openings in the burner plate is used. The heater also comprises a nose cone between the outlet in the outer shell and the exhaust plate.

Abstract: A vented, gas-fired air heater especially designed for temporary heating applications includes an improved burner design providing effective air and gas mixing and efficient burning in the combustion chamber. Highly efficient heat exchanger including corrugated heat exchanger panels provides enhanced heat transfer characteristics.

Abstract: A vented, gas-fired air heater especially designed for temporary heating applications includes an improved burner design providing effective air and gas mixing and efficient burning in the combustion chamber. Highly efficient heat exchanger including corrugated heat exchanger panels provides enhanced heat transfer characteristics.

Abstract: A vented, gas-fired air heater especially designed for temporary heating applications includes an improved burner design providing effective air and gas mixing and efficient burning in the combustion chamber. Highly efficient heat exchanger including corrugated heat exchanger panels provides enhanced heat transfer characteristics.

Abstract: A vented, gas-fired air heater especially designed for temporary heating applications includes an improved burner design providing effective air and gas mixing and efficient burning in the combustion chamber. Highly efficient heat exchanger including corrugated heat exchanger panels provides enhanced heat transfer characteristics.

Abstract: A direct-fired heater suitable for connection to duct work is disclosed. The heater comprises an outer shell comprising an inlet for allowing inlet of air to be heated and an outlet for exhausting heated air. A fan blade is operatively connected to a fan motor for operating the fan blade. The heater also comprises a combustion chamber defined by a combustion chamber wall, a burner plate at one end proximate the fan blade and an exhaust plate at an opposite end, the burner plate having openings therein for allowing airflow into the combustion chamber and the exhaust plate have an opening therein for allowing exit of heated exhaust from the combustion chamber, the combustion chamber wall extending past the burner plate. A first airflow zone exists between the outer shell and the combustion chamber allowing airflow between the fan blade and the outlet in the outer shell. An injector for injecting gas into the combustion chamber in proximity to the openings in the burner plate is used.

Abstract: A vented, gas-fired air heater especially designed for temporary heating applications includes an improved burner design providing effective air and gas mixing and efficient burning in the combustion chamber. Highly efficient heat exchanger including corrugated heat exchanger panels provides enhanced heat transfer characteristics.