AIRTECHZ · GH / GTH series
Heavy Duty Wall Mounted Exhaust Fan
A robust wall exhaust fan with a powerful direct-drive motor, thickened steel blades and a reinforced mounting frame.
Choose from nine sizes, from 250 to 900 mm, with motor housing and guard options to suit your installation.
Request a quotationCompare all models
Installation options
Front and rear guard options
Front and rear wire guards are available to improve protection around the rotating propeller. Select the guard arrangement to suit the mounting position and access to both sides of the fan.
Forward and reverse ventilation configurations are available. Confirm the required airflow direction and wiring before ordering; reverse-direction performance is not separately listed.
Motor configuration
Sealed motor, two housing options
The sealed, high-performance motor is available with a cast aluminium alloy housing. A cast iron motor housing is also available for orders with different thermal-performance requirements.
The motor drives the propeller directly. Specify your power supply and the required motor housing when requesting a quotation.
- Cast aluminium housing: finned construction, as shown in the product photograph.
- Cast iron housing: optional configuration; confirm the model and operating conditions.
- Overheat protection: specify the thermal protection requirement so the motor configuration can be confirmed.
Match the motor to the supply
Smaller models are listed for 220 V single-phase operation. Several mid-range models have 220/380 V and single-/three-phase versions. The 750 and 900 mm models are listed at 380 V, three phase.
Frequency is 50 Hz throughout the listed range. Please identify the exact voltage, phase and required operating duty in your enquiry.
Built for stability
Thickened blades and a robust steel frame
The GH series uses thickened steel for the propeller and mounting frame, with a powder-coated finish. The rigid construction is designed to provide a stable installation and reduce vibration during operation.
Thickened fan blades
Wide, pressed steel blades with formed reinforcing ribs. The blade profile is CAD optimised for airflow and efficiency.
Rigid mounting panel
The square steel panel supports the circular fan opening and provides fixing holes around the perimeter.
Nine size options
Nominal propeller diameters of 250, 300, 350, 400, 450, 500, 600, 750 and 900 mm cover different ventilation duties.
Material and measurement photographs show construction details. Confirm the blade and frame thickness for your selected model when ordering.
Technical data
GH and GTH model specifications
Compare power, speed and airflow together when selecting a model. Rated frequency: 50 Hz.
On smaller screens, scroll the table sideways to view every column.
| Model | Size (in / mm) | Voltage (V) | Phase | Power (W) | Speed (r/min) | Airflow (m³/min) | Noise dB(A) |
|---|---|---|---|---|---|---|---|
| GH-25 | 10 / 250 | 220 | 1 | 50 | 1,400 | 15 | 50 |
| GH-30 | 12 / 300 | 220 | 1 | 100 | 1,400 | 30 | 69 |
| GH-35 | 14 / 350 | 220 | 1 | 150 | 1,400 | 40 | 70 |
| GH-40 | 16 / 400 | 220 / 380 | 1 / 3 | 165 | 1,400 | 48 | 74 |
| GH-45 | 18 / 450 | 220 / 380 | 1 / 3 | 230 | 1,400 | 82 | 78 |
| GH-50 | 20 / 500 | 220 / 380 | 1 / 3 | 260 | 1,400 | 93 | 78 |
| GH-60 | 24 / 600 | 220 / 380 | 1 / 3 | 700 / 330 | 1,400 / 960 | 196 / 105 | 80 / 76 |
| GTH-75 | 30 / 750 | 380 | 3 | 900 | 960 | 270 | 85 |
| GTH-90 | 36 / 900 | 380 | 3 | 750 | 720 | 350 | 82 |
Slash-separated entries identify listed versions or performance variants, not a guaranteed user-selectable speed setting. For GH-60, the two entries correspond to 700/330 W, 1,400/960 r/min, 196/105 m³/min and 80/76 dB(A). Confirm the required version. For m³/h, multiply m³/min by 60. Static pressure, pressure curves and noise measurement distance are not specified.
Installation planning
Dimension drawing and model sizes
Match the A–E labels in the drawing to the table below. All dimensions are in millimetres.
On smaller screens, scroll the table sideways to view every column.
| Model | A (mm) | B (mm) | C (mm) | D (mm) | E (mm) |
|---|---|---|---|---|---|
| GH-25 | 297 | 235 | 250 | 9 | 195 |
| GH-30 | 390 | 325 | 308 | 8.5 | 235 |
| GH-35 | 437 | 369 | 335 | 8.5 | 260 |
| GH-40 | 483 | 417 | 367 | 8.5 | 255 |
| GH-45 | 558 | 476 | 435 | 10.5 | 305 |
| GH-50 | 600 | 520 | 470 | 10.5 | 305 |
| GH-60 | 700 | 623 | 585 | 12 | 370 |
| GTH-75 | 898 | 768 | 710 | 13 | 425 |
| GTH-90 | 1050 | 900 | 820 | 17 | 435 |
Do not use the nominal fan diameter as the wall opening size. Confirm the model-specific cut-out, fixing arrangement and clearance for guards and motor before preparing the wall.
Packing & delivery
Assembled or space-saving SKD packing
Assembled packing as standard
Fans are supplied assembled as standard, with one unit per carton. Check the model-specific carton dimensions and weight below when planning delivery.
SKD packing option
For the optional disassembled packing arrangement, five sets of blades and frames are packed into one carton. Local assembly is required after receipt.
Confirm which components are included, the motor packing arrangement and the final shipping volume for the selected size before ordering.
On smaller screens, scroll the table sideways to view every column.
| Model | Net weight (kg) | Gross weight (kg) | Carton (cm) |
|---|---|---|---|
| GH-25 | 4.5 | 5.0 | 32 × 32 × 22 |
| GH-30 | 6.0 | 6.5 | 40 × 40 × 27 |
| GH-35 | 7.0 | 7.5 | 45 × 45 × 27 |
| GH-40 | 8.0 | 8.5 | 50 × 50 × 28.5 |
| GH-45 | 12.0 | 12.5 | 57 × 57 × 32 |
| GH-50 | 19.0 | 19.5 | 61 × 61 × 32 |
| GH-60 | 20.5 | 21.0 | 70.5 × 70.5 × 35.5 |
| GTH-75 | 35.0 | 37.0 | 92 × 92 × 44 |
| GTH-90 | 48.0 | 50.0 | 110 × 110 × 44 |
Applications & selection
General ventilation through an external wall
The range is suitable for general air exchange in commercial spaces such as stores, restaurants, cafés and garages, as well as schools, hotels and similar buildings.
Send the room dimensions, use of the space, desired airflow and available wall opening. If the fan will connect to ductwork, include the duct length, diameter, bends and outlet arrangement so the operating duty can be reviewed.
For grease-laden, corrosive, high-temperature or potentially explosive exhaust, describe the conditions before selecting a motor or fan configuration.
Questions before ordering
What sizes are available?
The nine nominal sizes are 10, 12, 14, 16, 18, 20, 24, 30 and 36 inches, corresponding to 250, 300, 350, 400, 450, 500, 600, 750 and 900 mm.
What is the standard colour and minimum order?
Standard supply colour is white. The minimum order quantity is 50 units. Product photographs show construction references in other finishes.
Are guards included?
Front and rear guards are optional. Specify the required guard arrangement for your installation when requesting a quotation.
Can the fan operate with long ductwork?
A pressure curve is needed to select a fan against duct resistance. Send the complete duct arrangement and target airflow so suitability can be checked.
Can the fan be supplied disassembled?
Yes. SKD packing is available, including a five-set blade-and-frame carton arrangement. Confirm the exact model, component packing and local assembly requirements before ordering.
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Request a GH series quotation
Tell us the model or diameter, voltage and phase, motor housing, guard arrangement, quantity and destination. We will confirm the configuration, packing and delivery details.
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