DIY Subfloor Kit 6 – VKM 150mm with two intakes 120m3


Product Description

This DIY Sub floor ventilation kit is designed to ventilate a sub floor space of up to 120m3 and comes with two intake points.
This kit includes the following components:

1x VKM 150mm Inline fan – Click here for full fan specs
2x 6m of 150mm duct – this can be easily cut to suit your system. If more duct is required please see ‘accessories’ below.
1x External Vent
2x Intake Vent
1x BTO 150 x 150 x 150
1x 24hour Timer (The timer is plugged into a standard power point)
1x Flex & Plug (The fan is then plugged into the timer). Flex & plug is wired to high speed. Customers purchasing additional speed controller accessory are advised that the lead and plug will need to be removed so the fan can be hard wired to the switch.
1x Roll of Hanging Tape
1x Roll of Duct Tape

These components were selected because they are suitable for DIY installation. Using this kit in conjunction with accessories which need hardwiring will require installation by an electrician.

This Sub Floor Kit Includes:


Some buildings have very little subfloor ventilation. Inadequate underfloor ventilation can lead to an accumulation of moisture in the sub floor. This in turn can cause structural and health problems for the home and it’s occupants.

The most common reason for inadequate under floor ventilation is that there not enough vents, or they are too small for the size and layout of building. Building extensions, building location and soil type can all contribute to problems in the subfloor.

This underfloor kit is specifically designed to service areas of up to 120 cubic meters. This kit also comes with a BTO (Y Junction) which allows for two intake points.

Installation Diagram

sub floor kit 4 diagram

VKM Centrifugal Fan Features

  • Long life ball bearing motor
  • Suitable for continuous running
  • IP X 4 rated motor
  • Includes mounting brackets
  • Overheating protection with automatic restart
  • Dynamically balanced turbines


Running Costs

This sub floor kit comes with a VKM 150mm inline fan – this is a 98w motor. Based on daily usage (4 hours per day) this fan will cost approximately $50 annually (or 96 cents per week).

Please note: These calculations are based on a rate of 35 cents per 1000w per hour, based on current peak time rates. Actual cost will vary depending on your individual rates and usage amount.

Additional information

Extract Capacity (free flow)


Power Consumption On High (Watts)


Noise (at 3m on low)

47 dB(A)

Recommended Subfloor Size (based on 5 air changes)

Up to 111m3

Motor Type

Centrifugal – These fans perform very well over long duct runs. This means that it will retain its capacity much more than any other type of fan.


Flex & Plug Included (can be plugged into standard power point), Please note: some optional controllers and accessories may not be suitable for DIY installation. Check individual product specifications before purchasing accessories

Type Of Fan


Fan Brand


Warranty On Fan

Fanco – The fan is covered by a 2 year replacement warranty – conditions apply. See for details.


Please be aware that this kit comes with a fan with a 'lead and plug'. For this reason returns for change of mind reasons cannot be accepted.

SKU: EUFUK3BTO Categories: ,

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