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Air Handling Units


Buffalo Fan Co. offers two major gas fired Air-Handling Unites (AHU) types: direct gas-fired and indirect gas-fired.

DIRECT GAS-FIRED AHU

Direct gas-fired AHUs have a gas burner installed directly in the outside makeup-air stream. The products of combustion (carbon dioxide [CO2], carbon monoxide [CO], nitrogen dioxide [NO2]) are discharged directly into the makeup air stream and supplied to the building area.

INDIRECT GAS-FIRED AHU

An indirect gas-fired AHU has a sealed combustion chamber where all products of combustion are discharged through a flue to the outside environment and no products of combustion are discharged within the make-up air supplied to the building. Such equipment also frequently is utilized for recirculating-air applications.

DIRECT-GAS-FIRED-AHU COMPONENTS

Though simple in principle of operation, direct gas-fired AHUs have sophisticated burner-control systems. Unit sizes range from 1,000 cfm with a heating capacity of 80,000 Btuh to 100,000 cfm with a heating capacity of 15 million Btuh. Direct-gas-fired-AHU components usually include housings, supply fans, outside air intake hoods, intake dampers, filters and burners.

AIR HANDLING UNIT HOUSINGS

AHU housings are made of galvanized or aluminized steel. Access panels are provided to access dampers, filters, burners, and fans / motors. AHUs located outside are provided with a sloped roof and standing seam joints.

AHU SUPPLY FANS

Fans typically are double-width double-inlet (DWDI) with forward-curved or backward-inclined blades. Fans can come with open drip-proof (ODP) or totally enclosed fan cooled (TEFC) motors. The most typical external static pressure in the 2- to 3-in.-wg range. Because most outside istalled air handling units can operate  below 0°F, fan motors and bearings are rated to handle lower temperatures. For applications that require supply-air temperatures higher than 110°F, the motors and fan bearings are rated for maximum design operating temperatures when placed in draw-through configurations.

AIR INTAKE DAMPERS AND HOODS

Outside air intake hoods or weather hoods are designed for an installation specific location and usually provided with bird screens. Outside-air intake isolation dampers are furnished to prevent cold air from dropping through a unit into a warm building and warm air from escaping through a unit during winter months, when it is not in operation. Low-leakage parallel blade isolation dampers are most standard. The fan discharge is located at the opposite to isolation-damper position.

AHU FILTERS

A filter cabinet normally has 30 / 30 filters in a V-bank configuration to increase filter area and reduce static-pressure drop across the filters. Higher-efficiency filters are used on application.

BURNERS

A burner consists of a cast-iron or aluminum pipe assembly with drilled gas orifices. The fuel-air mixing is controlled by perforated stainless-steel baffles attached to the pipe assembly. The burner can be placed in the outside airstream or in the outside / return mixed-air stream. But to prevent potentially hazardous combustion byproducts of indoor-air contaminants, the burner is placed in the outside airstream only. The required airflow across the burner must be within a specific velocity range (typically 2,500 to 3,500 fpm) for proper combustion. For variable airflow units, a modulating bypass damper or profile plate maintains the airflow velocity within the specified velocity range. Otherwise, the burner can experience inefficient operation, generate odors in the occupied spaces served, and create an un-safe increase in certain products of combustion.





Industrial gas-fired airhandler Heatcraft ahu air-handling units                     Industrial gas fired Heatcraft air handling unit airhandler





Buffalo Fan Co. Air Handling Units are well-known for:

LONG SERVICE LIFE:
We use premium quality industrial-grade materials and additional protective coatings for external surfaces and internal components of our Air Handling Units - to withstand the specific gases flow and the installation conditions of each application, industrial and commercial / institutional.

CAPACITIES: Up to 100,000 CFM for standard construction and larger, custom made on special request.

FLEXIBILITY: Every unit is designed for the specific installation and connections conditions. The unit floor area and its cross section dimensions are adjusted for precise room available at site.

EASY INSTALLATION: Packaged compact or sectional design provided with lifting arrangement and protections for easy transportation and handling / installation at site.

LOW MAINTENANCE: Service friendly design which provide large room inside cabinet, access doors, light and rigid floor ensuring accessibility to all components.

HIGH EFFICIENCY: Fans, coils, motors, humidifiers, filters, external insulation material, silencers, enclosure tightness, and other components are carefully selected and engineered for lowest energy consumption.

OPERATIONALLY SAFE: Safety devices and guards are provided in accordance to the international regulations and the customer specific requirements.

PRECISE PERFORMANCE: To match the customer capacities requirement utilizing
the computerized selection for each component.


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Industrial gas fired air handling units, direct fired and indirect gas fired air handlers.
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