Rytons A1® Fire-rated 125mm Dia. Ducting Kits

General Details

Features and Benefits:

  • A range of custom-made 125mm dia. spiral metal ducting kits with a choice of rectangular or round connector to suit HVAC supply and extract ducting 204x60mm/125mm dia.
  • Manufactured from A1 classified galvanised steel.
  • Three air brick styles and a round grille are available to meet different design, airflow and vent placement requirements in buildings. For cladding, flanged options cover cut edges to maintain the external appearance.
  • Rytons Metal Double Air Bricks maintain low resistance and have a high airflow of over 90% of the free area of the duct.
  • Rytons Round FlowRyt® Grille provides a good air flow with low resistance.
  • Grilles supplied custom powder coated to Class A2-s1, d0. Choose from the RAL Classic colour chart in matt, semi-gloss or gloss finishes to match cladding or brickwork. Signature architectural finishes are also available.
  • Built-in weather protection. Drainage holes in the air brick/grille provide discreet water outlets, and louvred styles feature angled grilles to promote runoff, reducing the risk of water transfer into the duct.
  • Air brick/plenum are brick size (rather than duct size) for easy installation using standard mortar joints for a neat appearance in brickwork.
  • Suitable for:
  • The external walls of high-rise relevant buildings over 18m high (11m high in Scotland).
  • The external walls of relevant buildings 11m+ in height or more than 5 storeys, undergoing unsafe cladding remediation work (Building Safety Act 2022).
  • The external walls of higher-risk buildings at least 18m high or with at least 7 storeys (Building Safety Act 2022).
  • The external surfaces of residential purpose group buildings more than 11m high.
  • The external surfaces of residential purpose group buildings 11m high or less where an external wall is within 1m of the relevant boundary.
  • Bespoke design service available. For further information contact our Technical Sales Office on 01536 511874 or email admin@rytons.com.
  • Telescopic fitting air brick allows the overall length of the ducting kit to be extended during installation, providing flexibility to accommodate minor variations in the external façade.

  • Supplied ready to install with no on-site assembly required.
  • Duct factory fitted to the plenum adaptor.
  • No screw fixing or sealing needed, saving time and labour and ensuring correct alignment and airtight joints.
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A1 Fire Classification Explained:

  • Rytons A1® Fire-rated 125mm Dia. Ducting Kits are made from galvanised steel. Galvanised steel is considered fire class A1 without testing, as per European Commission paper 96/603/EC referred to in BS EN 13501-1:2018.
  • Classification: A1. Definition: Non-combustible. Description: No contribution to fire.

Reference Material:

  • England & Wales: view extracts >>
  • Approved Document B: Fire safety (Volume 1) (2019 edition incorporating 2020 and 2022 amendments) for England.
  • Approved Document B: Fire safety (Volume 2) (2006 edition incorporating 2010, 2013, 2016, 2017 and 2020 amendments) for Wales.
  • The Building Safety Act.
  • Scotland: view extracts >>
  • Building Standards Scotland Domestic Technical Handbook.
  • Northern Ireland: view extracts >>
  • Technical Booklet B (Materials and workmanship) July 2013.
  • Technical Booklet E (Fire safety) 2012.
  • Amendments Booklet – 2022 (AMD 7).

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Return Grille Double Air Brick
Return Grille Double Air Brick: 18,720mm² free area (over 90% of the duct).
Custom RAL colour air brick in matt, semi-gloss or gloss finish achieving Class A2-s1, d0.
Custom connector for 204mm x 60mm or 125mm dia. ducting.
204mm x 60mm – custom overall length (including plastic duct connector RD5FR+RD5CONN – refer to drawing). Note: Rytons recommend adding 250mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
125mm dia. – custom overall length (including plastic duct connector RD5CONN – refer to drawing). Note: Rytons recommend adding 100mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
Properties: Class A1 fire-rated 0.9mm/0.5mm galvanised steel. Class A2-s1, d0 fire-rated RAL colour powder coating. Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Design 6109952/6109953.
Patent Pending.
Product Code: A1DK125RGD.
Download Drawing.  |  Download Golden Thread.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Return Grille Double Air Brick Flanged
Return Grille Double Air Brick Flanged (15mm flange with corner screw holes): 18,720mm² free area (over 90% of the duct).
Custom RAL colour air brick in matt, semi-gloss or gloss finish achieving Class A2-s1, d0.
Custom connector for 204mm x 60mm or 125mm dia. ducting.
204mm x 60mm – custom overall length (including plastic duct connector RD5FR+RD5CONN – refer to drawing). Note: Rytons recommend adding 250mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
125mm dia. – custom overall length (including plastic duct connector RD5CONN – refer to drawing). Note: Rytons recommend adding 100mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
Properties: Class A1 fire-rated 0.9mm/0.5mm galvanised steel. Class A2-s1, d0 fire-rated RAL colour powder coating. Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Design 6109950/6109951.
Patent Pending.
Product Code: A1DK125RGDF.
Download Drawing.  |  Download Golden Thread.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Square Holed Double Air Brick
Square Holed Double Air Brick: 18,064mm² free area (over 90% of the duct).
Custom RAL colour air brick in matt, semi-gloss or gloss finish achieving Class A2-s1, d0.
Custom connector for 204mm x 60mm or 125mm dia. ducting.
204mm x 60mm – custom overall length (including plastic duct connector RD5FR+RD5CONN – refer to drawing). Note: Rytons recommend adding 250mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
125mm dia. – custom overall length (including plastic duct connector RD5CONN – refer to drawing). Note: Rytons recommend adding 100mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
Properties: Class A1 fire-rated 0.9mm/0.5mm galvanised steel. Class A2-s1, d0 fire-rated RAL colour powder coating. Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Design 6109952/6109953.
Patent Pending.
Product Code: A1DK125SQD.
Download Drawing.  |  Download Golden Thread.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Square Holed Double Air Brick Flanged
Square Holed Double Air Brick Flanged (15mm flange with corner screw holes): 18,064mm² free area (over 90% of the duct).
Custom RAL colour air brick in matt, semi-gloss or gloss finish achieving Class A2-s1, d0.
Custom connector for 204mm x 60mm or 125mm dia. ducting.
204mm x 60mm – custom overall length (including plastic duct connector RD5FR+RD5CONN – refer to drawing). Note: Rytons recommend adding 250mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
125mm dia. – custom overall length (including plastic duct connector RD5CONN – refer to drawing). Note: Rytons recommend adding 100mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
Properties: Class A1 fire-rated 0.9mm/0.5mm galvanised steel. Class A2-s1, d0 fire-rated RAL colour powder coating. Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Design 6109950/6109951.
Patent Pending.
Product Code: A1DK125SQDF.
Download Drawing.  |  Download Golden Thread.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with FlowRyt® Double Air Brick
FlowRyt® Double Air Brick: 18,000mm² free area (over 90% of the duct).
Custom RAL colour air brick in matt, semi-gloss or gloss finish achieving Class A2-s1, d0.
Custom connector for 204mm x 60mm or 125mm dia. ducting.
204mm x 60mm – custom overall length (including plastic duct connector RD5FR+RD5CONN – refer to drawing). Note: Rytons recommend adding 250mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
125mm dia. – custom overall length (including plastic duct connector RD5CONN – refer to drawing). Note: Rytons recommend adding 100mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
Properties: Class A1 fire-rated 0.9mm/0.5mm galvanised steel. Class A2-s1, d0 fire-rated RAL colour powder coating. Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Design 6109952/6109953.
Patent Pending.
Product Code: A1DK125FRD.
Download Drawing.  |  Download Golden Thread.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with FlowRyt® Double Air Brick Flanged
FlowRyt® Double Air Brick Flanged (15mm flange with corner screw holes): 18,000mm² free area (over 90% of the duct).
Custom RAL colour air brick in matt, semi-gloss or gloss finish achieving Class A2-s1, d0.
Custom connector for 204mm x 60mm or 125mm dia. ducting.
204mm x 60mm – custom overall length (including plastic duct connector RD5FR+RD5CONN – refer to drawing). Note: Rytons recommend adding 250mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
125mm dia. – custom overall length (including plastic duct connector RD5CONN – refer to drawing). Note: Rytons recommend adding 100mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
Properties: Class A1 fire-rated 0.9mm/0.5mm galvanised steel. Class A2-s1, d0 fire-rated RAL colour powder coating. Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Design 6109950/6109951.
Patent Pending.
Product Code: A1DK125FRDF.
Download Drawing.  |  Download Golden Thread.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Round FlowRyt® Grille
Round FlowRyt® Grille (175mm dia. overall inc. flange with screw holes): 6,912mm² free area.
Custom RAL colour grille in matt, semi-gloss or gloss finish achieving Class A2-s1, d0.
Custom connector for 204mm x 60mm or 125mm dia. ducting.
204mm x 60mm – custom overall length (including plastic duct connector RD5FR+RD5CONN – refer to drawing). Note: Rytons recommend adding 250mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
125mm dia. – custom overall length (including plastic duct connector RD5CONN – refer to drawing). Note: Rytons recommend adding 100mm to the external wall measurement to ensure the duct and connector finish within the inner leaf.
Properties: Class A1 fire-rated 0.9mm/0.5mm galvanised steel. Class A2-s1, d0 fire-rated RAL colour powder coating. Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Design 6235658/6327476.
Patent Pending.
Product Code: A1DK125FRR.
Download Drawing.  |  Download Golden Thread.

NBS Specifications:

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Pressure Loss Data

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