Why Premium Components and Proper Installation Matter

Fresh Ventilation supplies a range of efficient and technologically superior sub floor ventilation products. Our exclusive design is based on years of knowledge, experience and trialling competing products.

Not all components are equal!

System Design

Instead of using a single larger fan, we use smaller fans but more of them.

More fans allow greater coverage, better efficiency and more extraction points.

A single larger fan makes more noise, uses more power and requires longer duct runs to cover the same area as two smaller fans. This is inefficient and leads to uneven duct lengths and subsequently uneven air flow.

Our smaller fans use the same size ducting as our exhaust grilles and we allow one exhaust grille per fan. This allows air to be freely exhausted without a reduction in air flow due to pressure buildup.

Larger fans need reducers to reduce the duct size so that they can be connected to exhaust grilles. This results in a reduction of air flow due to resistance.

When comparing our systems against other systems with the same suggested coverage areas, our kits include more fans, more duct, more extraction points and more exhaust grilles.

Our systems are designed to properly ventilate your sub floor area. Our kits include the necessary components and advice to do the job properly the first time.

Fans

Our 150mm super quiet energy saving EC motor mixed flow fans have a capacity of 515 m³/h.

The variable speed EC motor consumes a maximum of 31 W when running at full speed.

The variable speed EC motor makes a maximum of 31 dB(A) noise (3m breakout).

Our fans make less noise and use less power. Some larger fans use 193 W when operating and have less capacity than two of our smaller fans.

Our super quiet fans have a 2 year replacement warranty.

Duct

Our duct is manufactured in Australia from two layers of high grade metallised polyester bonded together with fire rated resin encapsulating spring steel wire.

Our duct is not prone to tearing or unravelling like single layer competing products.

Exhaust Grilles

Our exhaust grilles are anodised aluminium, not plastic.

Our grilles are weather proof and have a rodent proof mesh behind them.

Our grilles are easy to install since they replace two standard bricks. The back box fills the hole left after removing two bricks and the anodised grille clips into the back box and covers any gaps with a 25mm flange. They don't require partial removal of bricks to create a round hole.

Timer

Our digital timer has a battery backup. It won't lose time and start running in the middle of the night.

Our digital timer can be programmed differently on different days of the week. This is ideal when you want different operation on the weekends.

Why Sub Floor Ventilation is Important

Many pest and building inspectors recommend sub floor ventilation to reduce termite risk. These systems are very effective in homes that experience a continuing musty odour or where there is mould on shoes and clothes in wardrobes or on furniture in living spaces.

Your sub floor area may seem insignificant because it does not form part of your living room. However, the fact of the matter is that this space actually has a high impact on the quality of air you breathe in while you are indoors and may affect your health. Poorly ventilated sub floor areas are often damp. This dampness can result in mould, mildew, musty odours, wood rot and pest infestation in your sub floor area and can also contribute to the spread of mould, mildew and allergies above.

Sub floor ventilation can remove ground moisture from underneath raised floors, creating a drier and warmer sub floor area.

Types of Sub Floor Ventilation

The two main types of sub floor ventilation systems are:

Ducted sub floor ventilation systems using inline fans and duct.

Wall-mounted sub floor ventilation systems using wall-mounted fans.

Ducted Sub Floor Ventilation Systems

Fresh Ventilation supplies a range of efficient and technologically superior ducted sub floor ventilation products. Our systems utilise the latest in ventilation technology, with Australian made components and Italian made EC motor mixed flow fans by Vortice.

Ducted sub floor ventilation systems have significant advantages:

Duct can be run to problem areas.

The ability to have multiple pickup points means coverage is far greater.

Smart design can achieve excellent cross-flow ventilation.

Stale air can be drawn from deep in the sub floor area.

Premium mixed flow fans with centrifugal impellers are much quieter than most wall-mounted fans and outperform axial wall-mounted fans in a ducted system.

Wall-Mounted Sub Floor Ventilation Systems

Fresh Ventilation do not recommend or install wall-mounted sub floor ventilation products unless no other alternative is available. Wall-mounted systems have substantial limitations by design and mostly use inferior and noisy components further limiting their usefulness.

When access to a sub floor area is not possible, it may be possible to install wall-mounted fans. In this situation, the limited ventilation provided is better than none. Ask us how we can help if this applies to you.

Advantages of an Electronically Commutated EC Motor

Energy Efficiency: EC motor efficiency is often above 90%, allowing EC fans to consume up to 70% less energy, when compared to conventional fans. Running an EC fan at 80% speed saves nearly 50% of the energy.

Ease of Control: By continuously monitoring motor functions and automatically adjusting the control input, high efficiency is maintained throughout the operable speed range. EC motors are often capable of being turned down to 20% of full speed, while still maintaining 85% efficiency. Sensors that produce a 0-10V signal provide speed control without the need for a complex variable frequency drive.

Versatility: EC motors are capable of exceeding rated speeds. This allows fans with EC motors to achieve higher capacity within a smaller fan package.

Fan Specifications

Our EC motor centrifugal fans have the following qualities:

Plug and play operation in a standard power point or socket outlet.

Extremely low noise during operation

Can be silent at reduced fan speeds during operation

Motor manufactured by Vortice in Italy

2 year warranty

IP 45 protection rating.

10V (100% Speed)

Maximum absorbed power: 31 W.

Maximum delivery: 515 m³/h.

Pressure max: 237.3 Pa.

RPM: 2,030.

Sound pressure Lp 3m breakout: 31 dB(A).

Negative Pressure, Positive Pressure or Balanced Pressure?

All of our systems are available in any of the three pressure configurations – the components don’t change, the way they are installed determines the configuration.

Depending on how your sub floor ventilation fans are installed, they will either blow air into your sub floor area (positive pressure) or suck air out of your sub floor area (negative pressure). If you have two or more fans installed, it is possible for fans to both blow air in and suck air out of your sub floor area (balanced pressure).

Negative Pressure

Our most popular configuration. The logic behind a negative pressure system is that a greater quantity of stale air is sucked out of the sub floor area than the fresh air that is blown into it. The vacuum conditions created when stale air is continuously sucked out of the sub floor area will be filled by fresh air drawn in from outside.

Importantly, moisture and musty odours can be controlled since air is sucked out at a chosen location. However, the drying performance may be slightly slower than a positive pressure configuration.

Positive Pressure

A positive pressure system is the opposite of a negative pressure system. A greater quantity of fresh air is blown into the sub floor area using mechanical ventilation, which will as a result force the damp air out.

Positive pressure systems facilitate the drying up of damp or moist sub floor areas because dry air is constantly being blown over them. It can initially be more effective than trying to suck out moist air from damp surfaces. Caution needs to be taken to ensure that passive escape venting is sufficient for the damp air to leave the sub floor area to outside of the home, otherwise the dampness can end up rising into the home above.

Balanced Pressure

Your sub floor ventilation system can be configured as a balanced pressure system, but this needs to be carefully considered and understood before installation. Like any sub floor ventilation system, the key to an effective balanced pressure system is to ensure that it is installed properly.

One or more fans create a positive pressure by blowing dry and fresh air into the sub floor area. An equal amount of fans work using negative pressure to expel the same amount of stale and moist air from the sub floor area. It is balanced because the speed at which the air moves into and out of the sub floor area is the same.