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

General Details
  • A range of tailor-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.
  • Made from Class A1 fire-rated galvanised steel and compliant with regulations for the requirement of non-combustible ducting in the external walls of high-rise buildings over 18m (11m in Scotland) and those 11m and above undergoing unsafe cladding remediation work.
  • Choose from three Rytons Metal Double Air Brick grille styles or Rytons NEW Round FlowRyt® Grille to satisfy the design, airflow, and vent placement requirements of the building.  For cladding, flanged options cover cut edges to maintain the external appearance.
  • All Rytons Metal Double Air Brick designs maintain low resistance and have a high airflow of over 90% of the free area of the duct.
  • Rytons NEW Round FlowRyt® Grille option provides a good air flow with low resistance.
  • Air brick/plenum are brick size (rather than duct size) for easy installation using standard mortar joints for a neat appearance in brickwork.
  • All external grilles supplied custom powder coated.  Choose from the RAL Classic colour chart in matt, semi-gloss or gloss finish (achieving Class A2-s1, d0) for a grille that matches cladding or brickwork.  Signature architectural coatings are also available.
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  • Supplied ready to install with no on-site assembly required.
  • Duct factory fitted to the plenum adaptor on air brick designs.
  • No screw fixing or sealing needed, saving time and labour and ensuring correct alignment and airtight joints.

  • Telescopic fitting air brick allows the overall length of the kit to be extended during installation giving the flexibility to handle minor variations in the external façade.

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.  The material is not compromised at a temperature of 800°C, as required by the Building Regulations Approved Document B for ductwork spanning the cavity.  Classification: A1.  Definition: Non-combustible.  Description: No contribution to fire.

Reference Material:

  • England & Wales: view extracts >>
  • Approved Document B: Fire safety (2019 edition incorporating 2020 amendments).
  • Approved Document B: Fire safety (2022 amendments) for England.
  • The Building Safety Act 2022.
  • Scotland: view extracts >>
  • Building Standards Scotland Technical Handbook – Domestic: June to November 2022 and from December 2022.
  • Northern Ireland: view extracts >>
  • Technical Booklet B (Materials and workmanship) July 2013.
  • Technical Booklet E (Fire safety) 2012.
  • Amendments Booklet – 2022 (AMD 7).

Specifications:

  • Please note: If you can’t see a ducting kit to meet your requirements, we offer a bespoke service to design, fabricate and supply the perfect solution.  To discuss your requirements, call our technical sales office on 01536 511874 or email admin@rytons.com.

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.

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.

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.

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.

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.

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.

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.

NBS Specifications:

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Pressure Loss Data