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

L Vent

L Vent is a the slimest window vent in the range utilising a small 10mm rout and is suitable for profiles within limited space. Available in white and brown with bottom operation. Manufactured from PVC
Features & Benefits
Models & Control Options
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Features and Benefits


The L Vent is one of the slimmest window ventilators on the market and is suitable for low profile window frames where space to install a window vent is restricted.  


Key Stats;

  • Available in two models offering 1600mm² and 3200mm² equivalent area (England & Wales)


  • Available in two models offering 2000mm² and 4000mm² free area (Scotland)


  • Bottom operation


  • 10mm rout required


  • Available in a range of colours including white, brilliant white, brown, tan, white inner and then brown outer or tan outer


  • Smaller model offers excellent sound attenuation to 37dB(A) when in the open position


  • Fully accredited and tested
    The L Vent has been independently tested at a third party accredited test house to all of the current British Standards.  Please see performance tab for full air permeability, Watertightness, noise and equivalent area performance information. 

Models & Control Options

Physical Specification

Product Code 2000L 4000L

Equivalent area


1600 3200


(mm) l x h x d

263 x 15 x 18 485 x 15 x 18

Slot Height


10 10

Slot size (mm)

Length - Central gap - Length

203 203 - 20 - 203
Control B B

T, W, BW, B, 


T, W, BW, B, 


Scottish Building Regulations: Free Area Performance (see page 9 for full details), 2000L =2 000mm², 4000L = 4000mm². Control: Bottom (B). Colour: White (W), Brown (B), Tan (T), Brilliant White (BW), White Inner Brown Outer (WIBO), White Inner Tan Outer (WITO).

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