Independent Testing

our reputation 


The key for us to know we offer a quality product and service was to let independent people test it and find the faults if they could. We applied this theory to our draught-proofing system, the Ventrolla Perimeter Sealing System (VPSS), which was put through intensive independent testing, to British Standards. The result proved the system improves energy efficiency, without altering the appearance of the window.

VPSS ensures all the gaps around the sashes are filled, creating a fully sealed sash window or casement window. Furthermore, due to the low friction levels of the sealing system, the sliding operation of a sash window is restored to full working order.

The VPSS has been independently tested and its benefits verified by the British Board of Agrément and Acoustic Consultants Hann Tucker.


The Statistics that give true peace of mind:

  • VPSS is manufactured to British Standards (BS) 7386:1900 and is tested to British Standards 6375:1-2009; one of the most demanding European Quality Standards
  • The Ventrolla system exceeded Class 3, the highest level of 600Pa, which is the equivalent to 71 mph winds
  • The Ventrolla Perimeter Sealing System has been independently proven to improve the Window Energy Rating (WER) by up to 30%
 See what one of our customers said after having VPSS installed: 


“The standard of workmanship is superb: it far surpassed our expectations, very refreshing in this day and age. We love our new windows and think they are stunning. The house is Victorian and was draughty, it is now noticeable warmer. I cannot recommend Keith and Steve highly enough. They arrived when they said they would and were very accommodating, thoroughly professional and had a good sense of humour. Thank You!” – Mrs Robertson, Perth