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  • New item   Rotary deflector D355 | ball bearings | stainless steel | silver
    New item   Rotary deflector D355 | ball bearings | stainless steel | silver 1
    New item   Rotary deflector D355 | ball bearings | stainless steel | silver 2
    New item   Rotary deflector D355 | ball bearings | stainless steel | silver 3

    Rotary deflector D355 | ball bearings | stainless steel | silver

    Code: 23015
    Barcode: 4772318700376
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    Price 180.29 € VAT incl.
    ( 149.00 € VAT excl. )
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    Stainless steel rotary deflector (wind turbine) D355 with ball bearings. Fits onto a D355 ventilation duct, extracts air without electricity and protects the duct from rain and snow.

  • Product description

    Stainless steel rotary deflector D355

    A rotary deflector is a wind-turbine-type cap at the top of a ventilation duct. The wind spins the vaned head, creating negative pressure above the duct, so air is extracted from the rooms more effectively than through an open pipe. This model is designed for a D355 duct.

    Key point

    The head rotates on ball bearings – thanks to low friction it starts turning even in lighter wind, while the bearing wears less and runs more quietly. Stainless steel has no coating that can be damaged – it is corrosion-resistant throughout its thickness. The duct is protected from rain, snow and birds.

    Connection diameter
    D355 mm
    Material
    Stainless steel
    Bearings
    ball
    Colour
    Silver

    ⚠ For ventilation only

    The deflector is intended for ventilation ducts only – to extract humid and warm air. Do not install it on flues of stoves, fireplaces, sauna heaters or boilers: hot flue gases and acidic condensate will damage it, and there is a risk of fire and carbon monoxide (CO) poisoning.

    How it works

    • The deflector is fitted onto a D355 duct or pipe and fixed mechanically.
    • The wind spins the head; centrifugal force and the pressure difference draw air out of the duct.
    • Without wind the duct stays open – warm air rises by natural draught; as the wind picks up, extraction increases.
    operating principle and estimated air extraction | elsprendimai.eu
    ☝ Click the diagram to open an enlarged version.

    Estimated air extraction – D355

    Wind speed 2 m/s 4 m/s 6 m/s
    Air extraction, m³/h 360 710 1070

    Indicative estimate, not manufacturer data: actual flow depends on duct length and resistance, temperature difference and air supply to the room. Without wind, the duct works by natural draught.

    Technical specifications

    Product type Rotary deflector (wind turbine) for a ventilation duct
    Connection diameter D355 mm
    Material Stainless steel
    Colour Silver
    Rotating assembly Ball bearings
    Power supply Not required – wind-driven
    Purpose Removal of ventilation (exhaust) air
    Not suitable for Smoke and combustion products – flues
    Manufacturer Elsp Group

    Which material to choose?

    Material When to choose Deflector of this size
    Galvanised steel Houses, garages and outbuildings in a normal environment. D355 – view
    Painted steel Houses with brown or dark roofing, where appearance matters. D355 – view
    Stainless steel Coastal areas, livestock farms, production sites, damp rooms – where galvanised steel would last less. this one

    Where it is used

    • Ventilation ducts of houses, cottages and homesteads
    • Natural ventilation ducts of bathrooms, kitchens and basements
    • Ventilation of attics and roof spaces
    • Garages, workshops, storerooms
    • Outbuildings and technical rooms

    Installation diagram: common mistakes and the correct way

    Stainless steel rotary deflector D355 – installation diagram: wrong and right | elsprendimai.eu
    ☝ Click the diagram to open an enlarged version.
    ⚠ The diagram is for guidance only and may contain inaccuracies. Before installation, check it against the manufacturer's instructions and the roofing requirements.
    Responsibility for installation lies with the qualified specialist performing it. UAB „Elektrotechnikos sprendimai“ is not liable for installation or possible errors.
    ☝ Elsprendimai.eu recommends:
    • We do not have a separate base for this diameter – lead the duct through the roof with a tight seal (e.g. with a sheet-metal collar) or contact us and we will help you choose.
    • All stainless steel deflectors – in the subgroup.

    ✓ Pros

    • Ball bearings – smooth rotation even in lighter wind
    • Works without electricity, no running costs
    • Protects the duct from rain, snow and birds
    • Exact D355 size – no need to reduce the duct
    • Same-size versions available in other materials

    → Limitations

    • Most effective with at least a light wind (~2–3 m/s); without wind it acts as an open duct
    • In winter the head may ice up and stop – the duct stays open for draught
    • Not suitable for flues

    ⚠ Installation and maintenance

    • The deflector D must match the duct D – do not reduce the duct.
    • Install in an open spot, as close to the ridge as possible, not in the wind shadow of higher walls or trees.
    • Fix with screws, rivets or a clamp; seal the joint with the roof using a UV-resistant sealant.
    • Once a year check that the head rotates freely, without noise or wobble.
    • Roof work is work at height: use fall protection equipment.

    FAQ

    Does the deflector need electricity?

    No – it is driven by the wind and the natural draught of warm air.

    Will it turn in light wind?

    Ball bearings reduce friction, so the head starts turning even in lighter wind; with no wind at all, the duct works as an open one.

    Will it freeze in winter?

    In cold, damp weather the head may ice up and stop temporarily; the duct stays open, and once it thaws the head turns again. Do not cover the deflector for winter.

    Can it be installed on a chimney?

    No. This deflector is intended for ventilation ducts only; flues require dedicated chimney cowls.

    Do the bearings need lubrication?

    Normally not; once a year it is enough to check that the head rotates freely and does not squeak.

    In short

    Stainless steel rotary deflector D355 with ball bearings – natural ventilation without electricity for a D355 duct. Choose by duct diameter and, if needed, add a base of the same size. Unsure about the size or roofing? Send us the duct diameter and roof type – we will help you choose.

    Phone: +370 620 72733
    E-mail: info@elsprendimai.eu

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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