Roof Exhaust Fans

Roof exhaust fans remove heat, smoke, moisture, dust, and various process exhaust gases from industrial and commercial buildings. QIYUE FAN offers a wide range of roof-mounted axial and centrifugal exhaust fan configurations to meet diverse requirements regarding airflow, static pressure, roof clearance, and installation.

The product lineup includes direct-drive, low-profile, high-capacity, and axial roof exhaust fan designs, with configurations available to support continuous operation and project-specific roof integration.

Direct Drive Roof Exhaust Fan
The Direct Drive Roof Exhaust Fan is a roof-mounted ventilation fan for continuous exhaust in commercial and industrial buildings. The direct-drive motor connects directly to the fan wheel,...
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Low Profile Roof Exhaust Fan
The Low Profile Roof Exhaust Fan is a roof-mounted centrifugal exhaust fan designed for buildings with limited roof clearance, architectural height restrictions or a need to reduce equipment...
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High Volume Roof Exhaust Fan
The High Volume Roof Exhaust Fan is a roof-mounted ventilation fan designed for large-span buildings requiring high-capacity air exhaust. It is available in centrifugal and propeller...
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Axial Roof Exhaust Fan
The Axial Roof Exhaust Fan is a roof-mounted axial exhaust fan designed for high-volume air extraction in industrial, commercial and agricultural buildings. It is used for continuous removal of...
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Roof Exhaust Fan Series

Direct Drive Roof Exhaust Fans

Featuring a direct-drive motor configuration, these fans are ideal for roof exhaust systems requiring a compact drive layout and minimal belt maintenance. They are available in both upblast and downblast configurations.

Low Profile Roof Exhaust Fans

Designed for projects with limited roof clearance or building height restrictions, these fans feature a low-profile design. They are available in direct-drive or belt-drive configurations and cover a wide range of airflow capacities.

High Volume Roof Exhaust Fan

Suitable for large-span buildings requiring high-volume exhaust. This series handles higher airflow ranges and can be configured with direct-drive or belt-drive systems based on specific project conditions.

Axial Roof Exhaust Fans

Utilizing an axial flow design, these fans are suitable for roof exhaust applications requiring high airflow and low static pressure. They are available in both direct-drive and belt-drive options.

Roof Exhaust Fan Selection by Project Requirement

Project Requirement	Key Selection Factor	Fan Type / Configuration
General roof exhaust	Airflow + static pressure + discharge arrangement	Select fan type and drive according to duty
Limited roof height	Fan height + clearance + airflow	Low Profile Roof Exhaust Fan
Large building air extraction	Required airflow + system volume	High Volume Roof Exhaust Fan
High airflow / lower pressure	Airflow + static pressure	Axial Roof Exhaust Fan
Compact drive arrangement	Fan duty + maintenance space	Direct Drive Roof Exhaust Fan

Upblast and Downblast Exhaust

Roof discharge direction affects how exhaust leaves the building and how the fan interfaces with the roof.

Discharge	Typical Selection
Upblast	Directs exhaust upward and away from the roof surface; suitable where vertical discharge is required.
Downblast	Directs exhaust downward toward the roof area; suitable for applications where this discharge arrangement is acceptable

Drive Configuration

Drive Type	Selection Difference	Typical Use
Direct Drive	Motor connects directly to the fan assembly; compact arrangement with no belts or pulleys.	Restricted maintenance space, compact roof installations, fixed-speed operation
Belt Drive	Fan speed can be adjusted through the drive arrangement; motor is separated from the fan shaft.	Larger units and applications requiring fan-speed adjustment

Roof Installation & Building Integration

Qiyue Fan configures roof exhaust units to align with existing roof curbs, structural penetrations, duct risers, and clearance constraints before manufacturing.

Integration Item	Engineering Adaptation
Roof Curb Fitting	Base and cap interfaces are custom-sized for concrete, self-flashing, or insulated steel curbs with drip edges.
Opening & Duct Alignment	Inlet dimensions and companion flanges connect directly to roof openings and vertical duct risers without adapters.
Discharge Direction	Upblast (vertical discharge away from roof) Downblast (downward discharge for ambient exhaust).
Profile & Clearance	Low-profile housing options available for height-restricted roofs; load distributed across curb frames.
Outdoor Protection	Continuously welded casings with rain cowls, gravity backdraft dampers, and IP65/NEMA outdoor motor covers.
Vibration Isolation	Base structures fitted with internal neoprene or spring isolators to prevent structural resonance.
Maintenance Access	Access panels and external lubrication points positioned within roof clearance for routine servicing.

Roof Exhaust Fan Configurations

QIYUE FAN provides project-specific configuration for the following items:

Customizable Item	Available Specifications
Fan Type	Axial/centrifugal
Drive	Direct drive/belt drive
Motor	Power, voltage, frequency, phase, VFD
Fan Speed	RPM
Discharge	Upblast / downblast, discharge position
Fan Size	Diameter, height, overall dimensions
Material	Carbon steel, galvanized steel, aluminum, stainless steel
Roof Interface	Curb size, base, inlet/outlet, mounting holes
Mounting	Roof curb / structural support
Protection	Weather hood, bird screen, backdraft damper

How We Ensure Our Product Quality

Structural & Weatherproof Fabrication
Roof hoods, mounting curbs, and housings are fabricated from heavy-gauge galvanized steel or aluminum using continuous welding processes.

Duct & Curb Interface Precision
Roof mounting curbs and transition flanges are cut and formed to project-specific dimensions, ensuring precise alignment with existing roof openings and ductwork systems.

Two-Plane Dynamic Balancing
Impellers undergo dynamic balancing on horizontal balancing machines (compliant with ISO 1940 / AMCA 204 standards) to minimize operational vibration, reduce noise, and preserve bearing integrity.

Outdoor Drive & Component Alignment
Motors, shafts, and drive components are precision-aligned using laser alignment tools and dial indicators to prevent belt wear, shaft fatigue, and efficiency losses under continuous load.

Pre-Shipment Factory Acceptance Testing (FAT)
Complete units undergo operational inspections before shipment, with key parameters verified using optical tachometers, dry film thickness (DFT) gauges, and vibration meters.

Compliance & Audited Quality Systems

Integrated Management Systems: Manufacturing operations adhere to ISO 9001, ISO 14001, and ISO 45001.

Third-Party Verification: Facilities and business operations are audited on-site by TÜV Rheinland, with applicable industrial series covered by EAEU Declarations of Conformity for regional market entry.

Traceable Documentation: Project-specific Material Test Reports (MTR), dynamic balancing certificates, and factory test logs are archived and provided before shipment.

FAQ

Q: How do I select a roof exhaust fan?

A: Start with the required airflow and static pressure, then confirm the roof opening, installation height, discharge arrangement, motor requirements, and exhaust conditions.

Q: When should I choose a low-profile roof exhaust fan?

A: A low-profile configuration is appropriate when roof height, clearance, or overall fan height is restricted. QIYUE's listed low-profile series is specifically designed around reduced installation height.

Q: What is the difference between axial and centrifugal roof exhaust fans?

A: Axial roof exhaust fans are typically used for high airflow with lower system resistance. Centrifugal configurations are considered where greater pressure capability or a specific exhaust construction is required.

Q: When is direct drive preferable to belt drive?

A: Direct drive provides a more compact transmission arrangement and eliminates belts and pulleys. Belt drive provides greater flexibility for fan-speed adjustment and motor positioning.

Q: Can roof exhaust fans be integrated with existing ductwork?

A: Yes. Fan inlet/outlet dimensions, roof interface, mounting arrangement, and motor position can be coordinated with the existing duct and building layout.

Q: Can QIYUE FAN supply roof exhaust fans for EPC and OEM projects?

A: Yes. Fan performance, dimensions, mounting, electrical configuration, duct connections, and project-specific requirements can be coordinated for EPC and OEM applications.

We're known as one of the most reliable roof exhaust fans manufacturers and suppliers in China. With abundant experience, we warmly welcome you to buy advanced roof exhaust fans made in China here from our factory. All customized products are with high quality and competitive price.

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