Wall-Mounted Exhaust Fan 550 mm 7500 m³/h 550 W 140 Pa IP54 Axial, Harmann

Wall-Mounted 550 mm Exhaust Fan for Halls and Warehouses

• Brand: Harmann
• Model: WAX 550/W/4/7500S (cat. no. 72250034)
• EAN: 5901885927275
• Type: Wall-mounted axial exhaust fan
• Max airflow: 7,500 m³/h
• Power consumption: 550 W
• Protection rating: IP54

The Harmann WAX 550/W removes 7,500 m³/h from the room. The W in the designation stands for exhaust: airflow goes out of the room and is marked with an arrow on the fan. It creates negative pressure, which is what you want where heat, moisture or odour must be removed without spreading into adjoining spaces.

Blade diameter is 550 mm and the motor draws 550 W at 2.5 A on single-phase 230 V, with a maximum pressure of 140 Pa at 1,320 rpm. The motor has an external rotor in a flat design that keeps the build depth in the wall opening low. The rotor blades are black-painted steel, dynamically balanced to grade G4 per DIN ISO 1940, which keeps vibration down on a 21 kg unit.

The housing is a square mounting plate in profiled sheet steel with a powder-coated guard, and the whole unit is black. A junction box is fitted, and speed can be reduced with 140–230 V voltage control. A gravity shutter is available as an option and is not included. Swedish manual available on request.

Key benefits of the Harmann WAX 550/W

Capacity per installation point is the main advantage. 7,500 m³/h from a single 550 mm opening means a hall that would otherwise need two smaller fans can manage with one wall penetration, one power supply and one item to maintain. The drawback is noise: 73 dB(A) at three metres is the highest level in the WAX range and more than the 69 dB(A) of the 500 mm model. Where noise is the deciding factor, voltage control can bring down both airflow and sound.

How the fan is used in production, storage and farming

The fan is mounted in a wall opening and extracts clean, non-dusty air from the building. Typical installations are production halls with process heat, warehouses where moisture needs venting, workshops, and buildings in agriculture and the food industry. At five air changes per hour, 7,500 m³/h covers a space of around 1,500 m³.

Technical Specifications

A fit for: Ventilation contractors, maintenance managers in manufacturing, farmers with machinery sheds, facility technicians and warehouse managers.

Typical settings: Production halls with process heat, warehousing and logistics, agricultural machinery sheds, food industry and workshops.

Frequently Asked Questions (FAQ)

Does the Harmann WAX 550/W need make-up air in the building?

Yes, in practice. An exhaust of 7,500 m³/h creates negative pressure that must be replaced by the same volume of incoming air, otherwise the actual airflow drops and the fan pulls air in uncontrolled through doors, gaps and chimney flues. Provide supply air vents or a supply fan of matching capacity; the same range includes WAX models in the N version. The 140 Pa maximum pressure is not enough to overcome an airtight building on its own.

How loud is the Harmann WAX 550/W in operation?

73 dB(A) at three metres at full power, the highest level in the range, which needs considering when placing it near workstations or a site boundary. Reducing speed with 140–230 V voltage control lowers both noise and airflow, but the maximum operating temperature then drops from 60°C to 40°C, which limits use in hot process areas when a controller is fitted.

How does the Harmann WAX 550/W differ from the smaller WAX 500/W?

One step up in capacity and one step up in noise. The 550 mm model delivers 7,500 m³/h against 6,500 m³/h, draws 550 W against 420 W and weighs 21 kg against 16.5 kg, which affects both the wall opening and the fixings. Maximum pressure is the same, 140 Pa, and speed is 1,320 rpm in both. The difference in noise is four decibels: 73 dB(A) against 69 dB(A) at three metres.