What is the difference between direct and belt-drive CHA variants?

Direct-drive variants couple the motor and wheel in a compact arrangement. Belt-drive variants provide alternate catalog speeds and motor arrangements. Availability varies by model size, and selection must follow the applicable catalog curve.

Why use the CHA side-discharge arrangement?

The catalog explains that the 90° side-discharge arrangement can reduce system effect at a nearby duct turn compared to discharging directly into an immediate elbow, supporting smoother airflow and lower dynamic pressure loss.

How much straight duct is recommended after discharge?

The manufacturer catalog recommends maintaining approximately two to three wheel diameters of straight duct on the discharge side to achieve published catalog performance and predictable system operation.

Is every CHA fan approved for grease exhaust?

No. While the catalog typical-application page lists restaurant grease exhaust, its usage instructions state the fan is mainly for clean air and excludes easily burning, explosive, or powder-laden air. Confirm the selected model, construction materials, cleaning access, temperature limits, and project fire-code requirements in writing before specifying grease exhaust.

Are single-phase and three-phase motors available for every CHA model?

No. Availability varies by model and motor power. The catalog shows model-specific 220V single-phase options from CHA05 to CHA24. CHA28, CHA32, CHA36, and CHA40 show no single-phase option, but do list 220V or 380V three-phase choices.

Can the fan be installed outdoors or in damp areas?

The catalog states that outdoor or damp installation is possible when equipped with a proper drainage system and suitable weather protection. Confirm the enclosure, electrical isolator, and site layout before ordering.

What information is needed for a CHA centrifugal box inline fan quotation?

Send your required operating airflow (CFM or m³/h), external static pressure (in. wg or Pa), nominal duct diameter, discharge orientation (straight or side), mounting type (base or hanging), voltage/phase (e.g. 220V 1-phase or 380V 3-phase 60Hz), quantity, and project city.

What mounting options and isolators are available?

The catalog offers base-mounted and suspended hanging arrangements with standing or hanging neoprene and spring isolator kits. The complete isolation kit must be sized to the specified fan operating weight and installation arrangement.

Can you provide documents for consultant approval?

Yes. Catalog PDF, formal quotation, technical submittal, company profile, and official compliance documents (CR, VAT, ISO, COC) can be provided upon project review.

CHA Series

CHA Centrifugal Box Inline Fan

CHA centrifugal box inline fans are square-housed duct fans for commercial, factory, agricultural, and other extract ventilation systems. The CHA05-CHA40 catalog range includes circular duct connection, direct- and belt-drive arrangements, base or hanging installation, and straight or side discharge options. Final selection must use the required airflow and static pressure operating point.

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In brief

What is a CHA centrifugal box inline fan?

A CHA centrifugal box inline fan is a square-housed duct fan designed to connect to circular ductwork. CHA05-CHA40 catalog variants include direct- and belt-drive arrangements, base or hanging mounting, and straight or side discharge. Select the fan from its performance curve at the required airflow and static pressure, then confirm voltage, phase, materials, and application duty.

CHA centrifugal box inline fan with square housing and circular duct connection

CHA Square Inline Fan

CHA05–CHA40 range

Direct & belt drive

Straight or side discharge

CHA Square Inline Fan

Fan Type

Centrifugal Box Inline Fan

Series

CHA05-CHA40 Square Inline Fan

Installation

Circular Inline Duct / Base / Hanging

Discharge

Straight or Side-Discharge Catalog Arrangements

Drive Type

Direct and Belt-Drive Variants by Model

Selection Basis

Airflow at Static Pressure, Electrical Supply, Mounting, and Application Duty

Application Check

Is a CHA centrifugal box inline fan suitable for your duct system?

Evaluate your airstream, static pressure requirement, and duct installation before finalizing selection.

Good fit

Circular ducted commercial or factory exhaust systems
Known operating airflow and external static pressure requirement
Base-mounted equipment room or suspended inline ceiling installation
Need for straight inline or 90° side-discharge arrangement to reduce system effect

Confirm before selection

Grease-laden restaurant or commercial kitchen exhaust
Outdoor or damp installation requiring proper drainage arrangement
Galvanized sheet or stainless steel construction requirement
Motor voltage, phase (1-phase vs. 3-phase), and project frequency; the supplied model curves are shown at 60 Hz
Cleaning access hatch clearance and vibration isolator selection

Use a different documented fan

Certified emergency smoke extraction or life-safety high-temperature duty
Flammable or explosive vapor and gas airstreams
Powder-laden, combustible dust, or hazardous material exhaust
Any duty outside the selected model's written manufacturer approval

Important application note: The manufacturer catalog lists restaurant grease exhaust as a typical application, while its usage instructions also describe the fan as mainly for clean air and exclude easily burning, explosive, and powder-laden air. Confirm the selected model, construction, cleaning access, temperature limits, manufacturer acceptance, and applicable project/fire-code requirements in writing before specifying grease-laden kitchen exhaust.

Model Range

CHA model performance table

Catalog references for quotation and technical review. Published values list catalog speeds, voltages, drive arrangements, and approximate curve endpoints.

Buyer note: Airflow figures are approximate readings from catalog curves and are not guaranteed operating points. Select the exact fan where the project airflow intersects the calculated system static pressure on the applicable model, speed, power, voltage, and phase curve.

Swipe horizontally to compare all CHA models.

Model Name	Frequency	Voltage & Phase	Motor Power	Fan Speed	Drive Arrangement	Approx. Catalog Curve Airflow	Impeller Diameter
CHA05	60Hz	220-230V 1-phase	0.25 HP	1720 RPM	Direct Drive	Approx. 1,600 CFM	11 in.
CHA08	60Hz	220V 1-phase / 220V or 380V 3-phase	0.5 HP	1720 RPM	Direct Drive	Up to approx. 2,600 CFM	12.5 in.
CHA10	60Hz	220V 1-phase / 220V or 380V 3-phase	0.75 - 1.0 HP	1400 / 1720 RPM	Belt / Direct Drive	Up to approx. 3,800 CFM	14 in.
CHA14	60Hz	220V 1-phase / 220V or 380V 3-phase	1.0 - 1.5 HP	1400 / 1720 RPM	Belt / Direct Drive	Up to approx. 4,700 CFM	16 in.
CHA16	60Hz	220V 1-phase / 220V or 380V 3-phase	1.5 - 2.0 HP	1300 / 1720 RPM	Belt / Optional Direct	Up to approx. 7,000 CFM	18 in.
CHA18	60Hz	220V 1-phase / 220V or 380V 3-phase	1.5 - 2.0 HP	1000 / 1130 / 1300 RPM	Belt / Direct Drive	Up to approx. 7,600 CFM	20 in.
CHA20	60Hz	220V 1-phase on 2 HP direct / 220V or 380V 3-phase	2.0 - 3.0 HP	1130 / 1250 RPM	Direct / Belt Drive	Up to approx. 12,000 CFM	22 in.
CHA24	60Hz	220V 1-phase on 2 HP belt / 220V or 380V 3-phase	2.0 - 4.0 HP	900 / 1120 RPM	Belt / Direct Drive	Up to approx. 12,000 CFM	25 in.
CHA28	60Hz	220V or 380V 3-phase; no 1-phase option shown	3.0 - 7.5 HP	750 / 1000 / 1120 RPM	Belt / Direct Drive	Up to approx. 17,500 CFM	28 in.
CHA32	60Hz	220V or 380V 3-phase; no 1-phase option shown	5.5 - 10 HP	750 / 1000 / 1120 RPM	Belt / Direct Drive	Up to approx. 18,800 CFM	32 in.
CHA36	60Hz	220V or 380V 3-phase; no 1-phase option shown	10 - 15 HP	1000 / 1120 RPM	Belt / Direct Drive	Up to approx. 20,500 CFM	36 in.
CHA40	60Hz	220V or 380V 3-phase; no 1-phase option shown	15 - 20 HP	1000 / 1120 RPM	Belt / Direct Drive	Up to approx. 30,000 CFM	40 in.

Operating Note: Airflow figures are approximate readings from catalog curves and are not guaranteed operating points. Select the exact fan where the project airflow intersects the calculated system static pressure on the applicable model, speed, power, voltage, and phase curve. Dimensions and performance data are subject to change; confirm the selected operating point and current submittal before ordering.

About the CHA series

CHA Centrifugal Box Inline Fan Overview

A centrifugal box inline fan is installed within a duct system to pull or push exhaust air through connected circular ductwork. The CHA square inline fan series is built for commercial and extractive industry applications where reliable ducted ventilation and medium-pressure performance are required.

The catalog describes a compact square box design, laser-cut body structure with full mold and fully welded construction, galvanized or stainless housing options, and backward-curved aluminum alloy wheel. A hand-openable driven-cavity cover provides convenient daily cleaning and maintenance access.

Impeller balance is tested strictly in accordance with ISO 1940 grade G4.0. Both direct-drive and belt-drive variants are available across CHA05 to CHA40 sizes, supporting straight inline or 90° side discharge arrangements with base-mounted or suspended hanging isolators.

Features

Key features for ducted inline exhaust

A square inline fan range for ducted commercial and industrial extraction where low-noise operation, side discharge, installation flexibility, and service access are important.

Full mold and fully welded carbon-steel body construction

Galvanized sheet or stainless steel housing options for project environments

Catalog model-code options for backward-type impeller construction and lower-noise operation

Direct circular duct spigot connection for inline installation

Side discharge option to reduce system effect and pressure drop at duct turns

Base-mount and suspended hanging isolator installation arrangements

Hand-openable driven-cavity cover for routine cleaning and maintenance access

Catalog-listed factory, low-noise industrial, agricultural, and restaurant-grease applications subject to model and duty confirmation

Specifications

Technical specifications

Final selection depends on airflow, static pressure, grease load, duct route, discharge position, voltage, mounting method, and site conditions.

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Specification	Available Options / Details
Product Category	Inline Fan
Product Type	Centrifugal Box Inline Fan
Series	CHA05-CHA40 Square Inline Fan
Installation	Inline circular duct connection, base mount, or suspended hanging isolators
Duct Connection	Designed for direct connection in line with standard diameter circular ducting
Discharge Position	Straight inline or 90° side discharge options according to duct layout
Housing Construction	Carbon steel body; galvanized sheet or stainless steel housing options
Impeller Wheel	Aluminum alloy wheel standard; carbon steel and stainless steel options documented by environment
Impeller Balance	Strictly balanced to G4.0 ISO 1940 standard
Frequency	60Hz catalog reference
Voltage & Phase	220V single-phase options are model/power specific from CHA05-CHA24; 220V or 380V three-phase options are listed from CHA08-CHA40
Power Range	0.25 HP to 20 HP catalog range
Model Range	CHA05, CHA08, CHA10, CHA14, CHA16, CHA18, CHA20, CHA24, CHA28, CHA32, CHA36, CHA40
Drive Types	Direct drive and belt drive options depending on model and speed
Applications	Factory exhaust, low-noise industry, restaurant grease exhaust (subject to confirmation), agricultural ventilation
Application Exclusions	Catalog usage instructions exclude easily burning, explosive, and powder-laden airstreams; the supplied catalog does not establish emergency-smoke approval
Accessories	Neoprene isolators, spring isolators, hanging brackets, base brackets, flexible connectors, control boxes
Documentation	Catalog PDF, quotation, technical selection, and procurement documents on request

System Comparison

CHA centrifugal box fan compared with other inline fan types

Match your project static pressure, airflow, duct routing, and life-safety criteria with the correct fan type.

Swipe horizontally to compare all columns.

Fan Category	Best Application Fit	Design & Construction Detail
CHA Centrifugal Box Inline Fan	Ducted commercial and factory exhaust selected from centrifugal performance curves; kitchen duty requires confirmation	Square serviceable housing, circular duct connection, pressure-based curve selection, direct/belt and side-discharge variants.
VMD-A Axial Inline Fan	Clean-air air transfer and circular duct systems matching axial curves	Hybrid axial inline fan with belt-drive and bearing components positioned outside the conveyed airflow, selected from its axial performance curves.
VKF Inline Axial Duct Fan	Compact clean-air circular duct ventilation for smaller general duties	Flanged axial casing for low-pressure, direct circular duct connection where compact dimensions are required.
VDO Axial Smoke Extraction Fan	Application-specific emergency smoke extraction where the required temperature rating and approval are documented	Application-specific smoke-extraction option; confirm required temperature rating, certification, and project approval.

Applications

CHA centrifugal box inline fan applications

Use CHA centrifugal box inline fans for ducted exhaust where the fan is installed in line with circular ducting and selected by airflow, pressure, and discharge direction.

Restaurant grease exhaustCatalog-listed application; confirm grease duty, cleaning access, materials, temperature, and project approval.

Commercial kitchen exhaustCatalog-listed application; confirm grease duty, cleaning access, materials, temperature, and project approval.

Factory exhaustProcess fumes, warm air, and ducted plant-room exhaust

Low-noise industryContinuous exhaust air with low-breakout acoustic requirements

Agricultural ventilationMoist clean air, barn odor, and warm indoor air

Ducted ventilationInline exhaust air across commercial and institutional duct systems

Commercial buildingsGeneral building exhaust, return air, and utility room ventilation

MEP project supplySelected by operating airflow (CFM), static pressure, and duct route

Application boundary: Flammable, explosive, and powder-laden airstreams are excluded by the manufacturer catalog usage instructions. For high-temperature life safety, select a certified VDO Axial Smoke Extraction Fan.

Selection support

What to Send for Correct Selection

Share the available project details and the team can guide CHA model size, airflow, static pressure, discharge position, isolators, voltage, and quotation before procurement.

Application type and airstream description (clean air, commercial kitchen, factory, etc.)

Required operating airflow in CFM or m³/h

Calculated external static pressure in in. wg or Pa

Circular duct diameter, duct route, number of elbows, and discharge orientation

Preferred CHA model if already scheduled

Direct-drive or belt-drive preference if specified

Base mount or suspended hanging mount with neoprene/spring isolator requirement

Electrical supply: voltage (220V / 380V), phase (1-phase / 3-phase), and frequency (60Hz)

Housing and impeller material, cleaning-access clearance, weather protection, and drainage requirements

Quantity, Saudi project city, drawings, and required consultant or procurement documents

Accessories

Inline fan accessory options

Accessories can be included according to duct installation, vibration isolation, support method, electrical control, and project submittal requirements.

Neoprene Isolators (Standing & Hanging)

Spring Isolators (Standing & Hanging)

Hanging Support Brackets

Base Mount Brackets

Flexible Duct Connectors & Circular Flanges

Compatible speed controller / transformer - confirm motor compatibility

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