NPSA door impresses during sound reduction test

October 28 2021

Rhino Doors, the UK’s leading manufacturer of high-performance engineered doors, has successfully conducted acoustic testing on its NPSA (formerly CPNI) door to assess for sound reduction. 

For many years, Rhino has been producing both single and double leaf personnel doors, tested in accordance with NPSA attack delay security standards. 

Now, due to an increasing number of requests from clients across many sectors, the company is manufacturing these high-security doors with both fire and acoustic ratings. 

Last month, Rhino Doors put its standard NPSA door to the test at the UKAS accredited acoustic test facility at Salford University, where the door was tested in accordance with ISO 10140-2: 2010. 

The door (pictured) was mounted in an acoustic test chamber, comprising two cells with a partition wall and sample door between them. 

With the noise-generating source in one cell and high-sensitivity microphones and deflectors in the other, the NPSA door was put to the test to measure its effectiveness at sound reduction, achieving an impressive rating of Rw 43dB. 

Ten days later, the NPSA door underwent a fire test in accordance with EN1634-1: 2014, achieving an integrity rating of 60 minutes (E60) and an insulation rating of 30 minutes (I2). 

The door’s integrity rating was double what Rhino Doors’ engineers had expected, and its radiation performance was particularly impressive, continuing to achieve <5kW/m2 when the test was discontinued after 74 minutes. 

“When we decided to put our standard NPSA door through its paces with an acoustic test, we didn’t know quite how it would hold up,” said Ceri Couser, Head of Security Projects at Rhino Doors. 

“But we are very pleased with the door’s performance and its demonstrated effectiveness at sound reduction, and equally delighted with the fire test performance, both of which are testament to the strength of the underlying design. 

“In recent years, our clients have begun seeking NPSA doors that possess additional performance capabilities in sound reduction and fire safety, as well as the standard attack delay performance. 

“The success of these acoustic and fire tests will, I hope, broaden the appeal of our NPSA door and see it finding new, innovative applications across a range of different industries.” 

To find out more about Rhino’s NPSA doors, visit


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