Direct-Fired AHU
High-efficiency air handling unit that directly heats air using gas combustion. Significantly reduces energy costs compared to electric heaters, with rapid temperature rise for large spaces and precise proportional control.
Direct-fired AHUs are particularly advantageous where large volumes of air need to be heated rapidly. NBPKOREA designs custom AHUs reflecting site-specific temperature, airflow, installation space, and control requirements — from automotive paint lines to shipbuilding and logistics facilities.
Applications
Direct-Fired AHU Flow
Combines direct-fired heating and blower control to rapidly establish the required temperature conditions.
Product Features
Key Capabilities
Heating Response
Rapid Temperature Rise
Effective at reducing initial heat-up time for large spaces and process lines.
Thermal Efficiency
Direct Heat Transfer
Direct-fired method reduces heat exchange losses for high-efficiency operation.
System Control
PLC Modulating
Airflow and temperature can be continuously adjusted in response to load changes.
Field Engineering
Custom AHU Design
Custom design proposed based on heating capacity, airflow, installation space, and process conditions.
Core Modules
Burner Section
Integrates the direct-fired combustion unit and safety devices for rapid heat-up and stable heat supply.
Damper / Mixing Section
Adjusts the mixing ratio of outdoor and return air to achieve the required supply air conditions.
Blower Section
Fan capacity and duct integration are designed to match the required airflow and static pressure.
Automatic Control
PLC, temperature controller, and interlocks work together to control combustion and airflow.
Design Considerations
Ventilation Conditions
Heating capacity and airflow are calculated reflecting outdoor air ratio, exhaust linkage, and indoor pressure conditions.
Heat-Up Speed
Burner capacity is reviewed based on the time required to reach target temperature and load variability.
Safety Design
System is configured with combustion safety devices, gas interlocks, and high-temperature protection logic.
Installation Space
Casing and maintenance access are reviewed according to outdoor, rooftop, or indoor installation conditions.
Specifications
While direct-fired AHUs excel at rapid heat-up and high-volume air handling, ventilation rates and combustion safety conditions must also be carefully considered. Heating capacity and control configuration are custom-designed based on the purpose — whether process ventilation, heating, or drying.
Considering a Direct-Fired AHU?
We will propose optimal specifications matched to your heating capacity, airflow, control method, and installation environment.