Custom Packaged air-handling units:
gas-fired, indirect and direct AHU
multi-zone ad mixed-flow AHU
for all types of industrial and commercial applications:
- Clean Rooms
- Food Processing
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.
DIRECT AND INDIRECT GAS-FIRED AHUsCanada Blower makes two primary gas-fired AHU types: direct gas-fired and indirect gas-fired.
DIRECT GAS-FIRED AHUA direct gas-fired AHU has 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 AHUAn 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 COMPONENTSThough 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.
AHU HOUSINGSAHU 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.
SUPPLY FANSFans 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.
INTAKE DAMPERS AND HOODSOutside 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.
FILTERSA 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.
BURNERSA 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.
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Liquid-to-Air Heat Exchangers
Air-to-Air Heat Exchangers
Air Handling Units
Suppliers of industrial regenerative side channel blowers, forward curved pressure blowers and fans in stainless steel, alloy, cast aluminium, cast iron, polypropylene and FRP construction. Canadian Blower, Chicago supplies replacement forward curved blowers and wheels for forward curved blowers and fans manufactured by Buffalo Blower - New York, Twin City Fan, Northern Blower, Chicago Blower, Sheldons, Cincinnati Fan, Hartzell, IAP, Industrial air products, Canadian blower, Aerovent, Penn Ventilation, Penn-Barry, Barry Blower, ACME, Aerovent, Alphair, American Fan, Lau Industries, Clarage, Delhi, Canarm, Leader Fan, Daltec, ABB, Flakt, Flaktwoods, Woods, MK Plastics, Robinson Industrial, Garden City Fan, Loren Cook, Jen-air, Jenn Fan, Aeroflo, Grainger, Greenheck, Kice Fan, ILG Industries, Canada Fan, Industrial Air, Ceilcote, Breidert, Anderson 2000, Solar and Palau, Strobic air, Trane, TCF Axial.
The most common configuration for air curtains is a downward-facing blower fan mounted over an opening. Normally this opening is an entrance to a building, and the air curtain is intended to help keep flying insects out by creating forceful turbulence. It also helps keep outside air out, avoiding cold drafts by mixing-in warm air from the air curtain. The fan must be powerful enough to generate a jet of air that can reach the floor.
The most effective air curtain for containing heated or cooled air inside a building with an open door will have a high face velocity at the opening, generated by top-down flow, recovered by a recirculating air plenum and duct return to the source fans. This configuration is available for new construction, but difficult to provide in existing buildings. The air curtain is most effective with low exterior wind velocity. At higher wind velocities, the rate of air mixing increases and the outside air portion of the total face flow increases. Under ideal conditions of zero wind, the effectiveness of the air curtain is at its maximum.
For industrial conditions, high face velocities are acceptable. For commercial applications like store entrances, user comfort dictates low face velocities, which reduce effectiveness of separation of exterior air from interior air.
Non-heated air curtains are often used in conjunction with cold storage and refrigerated rooms. Airflow through a door depends on wind forces, temperature differences (convection), and pressure differences.
Air curtains can be used to save energy by reducing the heat transfer between two spaces, although a closed and well-sealed physical door is much more effective. A combination is usually utilized; when the door is opened air curtain turns on, minimizing air flow from inside to outside and vice versa
A variety of installation options are available to cater for building and architectural features such as suspended ceilings but the most common is simply bolting the unit to the wall above the doorway and connecting a single phase supply and switch to the unit.
Power consumption is negligible for a normal sized doorway opening - about 300 W. Some units can even be specified with a heating element to warm an enclosed area.
Air curtains block the flow
An air curtain simply creates a block in the air flow through an opening. The air velocity of the curtain must then be great enough to direct the resulting velocity downward and ensure that a small part of the air stream goes out while the main air flow comes back into the room.