Permavent - Greenwood

Our Permavent range

  • Bar Carrier

    PVC Glazed in option available for a range of window profiles and sizes. Standard white bar carrier can be installed with a range of slotvent options for varying airflow performance. 55mm glass reduction. Single and double glazing options available. Minimum and Maximum lengths apply.


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Our glazed-in range is a collection of high quality, robust solutions that comply with current window ventilation requirements for Building Regulations. Both aluminium and PVC options are available, offering a wide choice of control options and equivalent area performances for both new build and refurbishment applications. With one of the smallest glass reductions required, both systems offer a pleasing and acceptable finish once installed.


All Greenwood products are tested at third party UKAS accredited test houses to all current British and European standards;

BS EN 13141-1:
2004 Ventilation for Buildings

BS EN 1026:
2000 Air Permeability

BS EN 1027:
2000 Watertightness

BS EN ISO 717-1:
1997 Airborne Sound Insulation

Please note:
GVC and GVG products are cut and manufactured to your specific requirements and are available for large window replacement programmes – please call us to discuss your options.

Window Vent Regulations;

Download the Building Regulation requirements for window vents for new build and refurbishment projects;

Zehnder Group