Premix air heater

摘要

A gas-fired heater (100) includes a gas supply line (110), an air supply line (130), a valve (120) coupled to the gas supply line (100) and a controller (122) coupled to the valve (120). The controller (122) is configured to control the valve (120) to control a gas-air mixture. The gas-fired heater also includes a burner (140) configured to receive the gas-air mixture and burn the gas-air mixture, and a heat exchanger (150) coupled to the burner (140). The heat exchanger (150) is configured to perform a heat exchange process and output heated air. The gas-fired heater (100) further includes a combustion fan (160) located downstream of the heat exchanger (150), the combustion fan (160) being configured to pull or draw flue gases through the heat exchanger (150).