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

Key Facts — Harmann WAX 550/W/4/7500S Extract Fan

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

The Harmann WAX 550/W removes 7,500 m³/h from the building. The W in the designation stands for extraction: air flows out of the room, marked by an arrow on the unit. It therefore creates negative pressure, which is what is wanted where heat, moisture or odour has to go but must not spread into adjoining spaces.

Blade diameter is 550 mm and the motor draws 550 W at 2.5 A from single-phase 230 V, with a maximum pressure of 140 Pa at 1,320 rpm. The motor unit uses an external rotor in a flat assembly that keeps installation depth in the wall opening down. Impeller blades are black-painted steel, dynamically balanced to class G4 per DIN ISO 1940 — that balancing is what keeps vibration under control on a 21 kg unit.

The housing is a square profiled sheet steel mounting plate with a powder-coated protective grille, the whole unit in black. IP54 enclosure, insulation class F (155) and integrated thermal motor protection cutting out at 150–160°C and resetting at 90–120°C. A terminal box is fitted, and speed can be reduced by voltage control across 140–230 V. A gravity shutter is optional and not included.

Key benefits of the Harmann WAX 550/W

Capacity per installation point. 7,500 m³/h from a single 550 mm opening means a hall that would otherwise need two smaller fans manages with one penetration, one electrical supply and one maintenance item. The trade-off is noise: 73 dB(A) at three metres is the highest level in the WAX range, above the 69 dB(A) of the 500 mm model. Where noise governs, voltage control is the route down in both flow and sound.

How the fan is used in production, storage and agriculture

The fan mounts in a wall opening and draws clean, dust-free air out of the building. Common installations are production halls with process heat, warehouses where moisture needs venting, workshops, and agricultural and food industry buildings. At five air changes per hour, 7,500 m³/h serves a space of around 1,500 m³.

Technical Specifications

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

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

Frequently Asked Questions (FAQ)

Does the Harmann WAX 550/W need compensating supply air?

Yes, in practice. Extraction at 7,500 m³/h creates negative pressure that must be replaced by the same volume coming in, otherwise actual flow drops and the fan pulls air uncontrolled through doors, gaps and flue channels. Provide supply air grilles or a supply fan of matching capacity — the same range offers WAX models in N configuration. The 140 Pa maximum pressure is not enough to overcome a sealed building on its own.

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

73 dB(A) at three metres at full output, the highest level in the range, which needs consideration when siting near workstations or a property boundary. Reducing speed with voltage control across 140–230 V brings both noise and flow down — but maximum operating temperature then falls from 60°C to 40°C, which limits use in hot process areas whenever a controller is fitted.

What separates the Harmann WAX 550/W from the smaller WAX 500/W?

One step up in capacity and one in noise. The 550 mm model gives 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 fixing. Maximum pressure is the same at 140 Pa, and speed is 1,320 rpm on both. The noise difference is four decibels: 73 dB(A) against 69 dB(A) at three metres.