Greenwood | Low Energy Bathroom Fan, Heat Recovery System, Whole House Ventilation

GB Vent

GB or Gas Board Vent is designed to provide ventilation for combustion environments and conforms to BS 5440 - Part 2: 2000. Permanently Open providing 5000mm2 free area. Available in white and brown. Manufactured from PVC
Features & Benefits
Models & Control Options
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Features and Benefits


The GB Vent is a through frame Free Area performance Designed for use in combustion environments and has been designed to provide the background ventilation rates as set out in the current Building Regulations ADF 2010.


Key Stats;

  • Designed for use in combustion environments


  • Offers permanent ventilation


  • Up to 5000mm² free area


  • 15mm routing option


  • Available in White & Brown


  • Fully accredited and tested
    The GB  Vent has been independently tested at a third party accredited test house and conforms to BS 5440 Part 2:2000 and requirements laid down in current Building Regulations.  Please see performance tab for full information.



Models & Control Options

Physical Specification
Product code 5000GB

Equivalent area




(mm) l x h x d

400 x 22 x 29

Slot height



Slot size (mm)

Length - Central gap - Length

176 - 20 - 176
Control Permanent
Colour W, B, BW

Colour: White (W), Brilliant White (BW), Brown (B)

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