• Frequently Asked Questions

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  • What does SEM mean?

    SEM stands for Silent- Extraction -Method.
    To achieve optimum ventilation, a strong motor is essential but this can often result in unwanted excessive noise in the kitchen. Sirius has devised a simple yet effective way of providing a well-ventilated kitchen without the unpleasant noise. We call it the Silent Extraction Method (SEM).
    What type of power outlet is required for my range hood?

    For rangehoods with onboard motors, a standard 10AMP power point is required at the point of installation. No powerpoint is required near offboard motor models, as a 7 metre cord is supplied with the motor.

    Why a SEM motor?

    Australians love open space and entertaining so minimising noise levels is paramount.
    A SEM motor allows you to have a selectively designed hood without the problem of noise as the motor can be placed externally or internally without compromising performance.

    What is an off-board motor?

    This is where is motor is not inside the Rangehood but away from the hood, for example in the roof.

    What is an on-board motor?

    Is when the motor is inside the hood itself.

    I have a two story house, can I place my external motor on the second floor?

    Yes, but it is not advised as it can affect the efficiency of your hood. The longer the ducting the worse the extraction. Furthermore try to have as few bends in the ducting as possible to increase the airflow.

    Can I have a SEM2 or SEM7 motor if I don’t have an eave to protect it?

    Yes you can as it is weatherproof however we do not recommend that you directly hose it down as it will damage the vent.

    How many power points do I need for my downdraft Rangehood?

    You only need one power source for the downdraft series.

    I don’t have space to use 200mm ducting on my 200mm recommended unit, can I use 150mm?

    No, definitely not, this will void any warranties and cause major problems to the extraction rate of your unit. Do not do it.

    What is the maximum recommend length of ducting from the rangehood to the motor to outlet?

    Depending on the range hood, we recommend a maximum of 7 meters and note for every elbow or turn in your ducting you lose 1 meter of total length. Ducting which is any longer may reduce performance of your range hood, depending on location and installation.

    What type of flues do you have for higher ceilings?

    Depending on model contact your nearest Sirius supplier for more information.

    What type of ducting do you recommend?

    We recommend the use of rigid or semi rigid ducting only. Flexible ducting is not suitable for an array of reasons such as noise, decreased efficiency, rippling and tearing etc. Use of flexible ducting will void your warranty, and we suggest you use our ducting for an extended warranty on your unit. Select units can use semi-rigid ducting only; ie the ducting can be placed directly on the motor. Please contact your retailer for a full range of Sirius Ducting.

    Can my current ducting from my existing range hood remain in my roof space?

    We don’t recommend it as an older hood will usually have unsuitable ducting. We suggest you check your local building regulations to ensure your rangehood is ducted to the outside of the home.

    What distance should the downdraft series be from the cook-top?

    We suggest that you place it as close as possible, between 30-60mm, please be aware of the benchtop material and adjust the distance accordingly. Additionally be aware that you may use large cooking pots that may exceed the edge of the cooktop so keep this in mind before you install it. Furthermore this series shouldn’t have any obstructions above the hood or this will affect accessibility for any service.

    What height do you recommend my Rangehood to be above my gas ,electric or BBQ cooktops?

    The current building code is 600 mm minimum and 650 mm maximum for induction cooktops, and 650 mm minimum and 750 mm maximum from the top of the trivets on gas cooktops. Our recommended distance is 700mm.
    Open grill BBQs have the higher height restriction to prevent flames caused by fat fires being sucked up into the hood. You must leave at least 900 mm (full hotplate) or 1200 mm (open grill) clearance.

    Where should the range hood be above the cooktop?

    We recommend the range hood is installed centrally over your cooktop and as far forward as possible so that the extraction area is above the whole cooktop.


    When choosing your ducting solution there a few choices to make.

    Rigid or semi rigid ducting? Rigid will provide the ultimate results from your hood with the least amount of noise. Sometimes in difficult installations caused by structural obstacles Semi Rigid is required. By Semi rigid, we do not mean fully flexible ducting which is available in the market. This can result in a noisy, vibrating hood that has limited extraction capabilities.

    Thickness of the ducting, we refer to as ‘gauge’. The 12 gauge is for internal use while 15 gauge is designed specifically for Alfresco hood installation as the hoods have a very high airflow which can increase vibration. The thicker ducting counteracts this effect, minimizing noise.

    The diameter of your ducting is determined by the outlet on your hood. Sirius hoods have a diameter of either 150mm or 200mm ducting. Other brands sometimes use a 125mm. We cater for this size also. Where possible, we recommend NOT reducing the ducting diameter during the installation as it reduces the airflow of your hood and can make your hood noisier.

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    If you need any assistance on our products or services or have a question you would like to ask,
    simply contact us.
    Phone: 1300 762 219
    Email: arisit@arisit.com

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