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Negative Pressure Unit 25 (M-Series NPU 25)

Thermac’s new range of M-Series negative pressure units has been developed with the end user in mind and comes packed with new features and benefits to assist contractors while on-site. These include the unique self-calibrating, backlit digital airflow monitor, which has been neatly housed within the casing.

Each NPU is constructed using a lightweight and robust ABS material making the units stronger, and easier to handle. They contain HEPA filters tested to an efficiency of 99.995% (H14) and their overall performance provide the user the confidence that these machines meet today’s stringent regulations.

Each new machine comes with 12 months limited warranty and 6 months D.O.P. and electrical test certificates and has the back up of Thermac’s service support department.

Both the NPU25 and NPU50 units include a roving pre-filter box.


Key features


Fitted with real time digital flow meter which is virtually maintenance free. The device is self-calibrating, when the unit is first switched on the display will auto zero, and as the unit is running continuously the display will auto zero every ten minutes. This is a unique feature as it elevates display drift and the need for periodic calibration


  • Fitted with hour meter

  • Complete with Roving Pre-Filter Box for use when localised extraction is required

  • Clip free magnetic transit covers

  • Recessed handles


M 25 Product Specification:

  • Construction: ABS Plastic

  • Voltage: 110 / 230

  • Watts: 1650 / 1886

  • Amps: 15 /  8.2

  • Dimensions: L: 1020mm x W: 450mm x H: 585mm

  • Weight: 43kg (without roving pre-filter box)

  • dB: 74.4

  • Nominal Airflow: 2300 m3/hr

  • HEPA Filter: 380mm x 380mm x 292mm (H14)

  • Pre-Filter: 15 x 15 x 4 (G4)

  • Ducting: 305mm

  • 2-Stage Filtration

  • Complies with BS 8520.2.2009


£1,390.00 excl VAT