• quad vent
  • EF10-4BK-150S REAR
  • env-transformer
  • env-low-voltage-cable
  • EF10-4SG-150S SIDE
  • EF10-4BK-150S
  • quad vent heritage

Envirofan Quad Fan Ducting System- Kit (EF10-4K-150S)



This Envirofan extracts 6.5M3 per minute (6,500 liters/min) at only 30dBa. It is installed into the exterior wall space and is just over two (2) bricks high.

  • Approximately 2 bricks high x 1 brick wide.
  • 6.5m3 (6,500 litres/min) @ 7.5volts from your sub floor area
  • 7.0m3 (7,000 litres/min) @ 30dba@1mtr from your sub floor @ 9volts

Packaged as a quad fan system integrated into the “square-to-round” which connects to 150mm duct, transformer with 6m of LVC (low voltage cable) and Brown, Shale Grey, White or Heritage external grill.

  • Can be used as a sub-floor ventilation system without the ducting.

NB-30dba is half the sound of a modern refrigerator.

SKU: EF10-4-K-150S Category:


  • Size: l-240mm x w-180mm x d-80mm.
  • 6.5m3 (6,500 litres) of damp air extracted from your sub-floor per minute.
  • Retrofits a 2 brick high terra-cotta vent.
  • Operates at 30dB@1m on 7.5v
  • Colour availability – White, Shale Grey, Brown and Heritage
  • Long life – fully serviceable.
  • Low voltage (12v – 13.2v) or solar powered.
  • Australian made.
  • 2 years manufacturers warranty.
  • Digital timer is recommended.


  • 12 volt system operates at 6 watts. This would mean the impact on power resources is much less than a 240v system which would reduce the carbon footprint.
  •  This system can be solar powered. (Would require 1 panel)
  • This sub-floor ventilation system can be used as a stand alone product without the use of the flexible ducting.
  • There is no need for an electrical license as the unit is low voltage. This would be ideal for the home handyman, pest technicians, plumbers, carpenters and builders.


The end of the duct can be positioned in the sub-floor where the musty smell is noticeable inside the dwelling and should be targeted where it is most pronounced. This can be verified by accessing the sub-floor area to determine that the musty smell is more concentrated in this area.
If the sub floor space has a minimal space whereby a brick size ventilation system cannot be fitted on the outside wall due to elevated ground levels equal to or above the sub floor area, then the EF10-4BK-150S which integrates the fan motor into the square to round 240 x 180 can be mounted into an existing terracotta vent or via a new opening in the brickwork, then the ducting is extended back into the sub-floor area where it is needed. The EF10-4BK-150S will accept 150mm flexi-duct or 150mm PVC plumbers pipe. Maximum length of ducting shall be no more than 6 metres. If desired may be used with no ducting.
Similar in principle to our In-Line and Cul-de-Sac ventilation systems as the sub-floor ventilation system extracts the damp air through the 150mm ducting to the outside. This Envirofan fan-forced ventilation system is for cases with limited ability to install on the exterior wall where the outside ground level impinges on the sub-floor area thereby the EF10-4BK-150S can be moved at a suitable position on the exterior wall and the end of the ducting postioned toward the area that needs to be serviced. Length of ducting cannot be more than 6 metres.

Additional information


White, Shale Grey, Brown, Heritage

© 2016 Envirofan Sub-Floor Ventilation Solutions, Sydney – Reduce Mould & Prevent Termites.
*Conditions may apply. All Rights Reserved. This material is subject to copyright. No reproduction, copying, altering or transmission of the above information is permitted without the prior written consent of the copyright owner.
Envirofan sub-floor ventilation systems are available in Melbourne, Gippsland, Adelaide, Perth, Brisbane, Gold Coast, Lismore, Mullumbimby, Northern Rivers, Coffs Harbour, Mid-North Coast, Port Macquarie, Taree, Hunter, Newcastle, Central Coast, Sydney, Illawarra, Wollongong, Shoalhaven, Eurobodalla, Southern Highlands, Canberra, Central West, Bathurst, Orange & the United Kingdom (UK).