DIY Subfloor Kit 4 – VKM 125mm with two intakes 70m3

This DIY Subfloor ventilation kit is designed to ventilate a sub floor space of up to 70m3 and comes with two intake points.
This kit includes the following components:

1x VKM 125mm Inline fanClick here for full fan specs
2x 6m of 125mm ductthis can be easily cut to suit your system. If more duct is required please see ‘accessories’ below.
1x External Vent
2x Intake Vent
1x T Junction 125 x 125 x 125
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.

$379.00 $429.00

This Subfloor Kit Includes:

sub floor kit

Some buildings have very little subfloor ventilation. Inadequate underfloor ventilation can lead to an accumulation of moisture in the subfloor. 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 70 cubic meters. This kit also comes with a BTO (Y Junction) which allows for two intake points.

Installation Diagram

subfloor 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 subfloor kit comes with a VKM 125mm inline fan – this is a 75w motor. Based on daily usage (4 hours per day) this fan will cost approximately $38 annually (or 74 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.

SKU: EUFUK2BTO Categories: ,
Extract Capacity (free flow)

Power Consumption On High (Watts)

Noise (at 3m on low)

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Type Of Fan

Fan Brand

Warranty On Fan