Rytons A1® Fire-rated 125mm Dia. Ducting Kits with Double Air Brick Grilles

General Details

Rytons A1® Fire-rated 125mm Dia. Ducting Kits with Double Air Brick Grilles

  • A range of custom-made 125mm dia. galvanised steel spiral metal ducting kits with a choice of rectangular or round connector to suit HVAC supply and extract ducting 204mm x 60mm/125mm dia.
  • Choose from three styles of air brick according to the design, air flow and positioning requirements of the development.
  • All air brick styles have a high air flow of over 90% of the free area of the ducting and maintain low resistance.
  • Custom RAL colour air brick in matt, semi-gloss or gloss finish (achieving A2-s1, d0).  Signature architectural coatings are also available.
  • Air bricks feature built-in weather protection, with angled grilles to promote runoff and precautionary drainage holes to prevent water transfer.
  • 100mm dia. and 150mm dia. ducting kits are also available.
  • Bespoke ducting kit design service available with in-house testing facilities for pressure loss data and equivalent area testing to BS EN 13141-1.
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  • No on-site assembly required. 
  • Ducting sleeve supplied factory fitted to the plenum adaptor.
  • No screw fixing or sealing required, saving labour and ensuring correct positioning and airtight joints throughout.
  • Suitable for use in high-rise buildings with a storey 18m or more above ground level to Regulation 7(2) and Building Regulations Approved Document B.
  • Suitable for use in buildings with a storey 11m or more above ground level to Building (Scotland) technical handbook 2019: domestic and non-domestic, 2.7.
  • Product considered fire class A1 without testing, as per European Commission paper 96/603/EC referred to in BS EN 13501-1:2018.
  • Material 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.

Rytons A1® Fire-rated 125mm Dia. Ducting Kits with Double Air Brick Grilles:

  • Bespoke ducting kit design service available with in-house testing facilities for pressure loss data and equivalent area testing to BS EN 13141-1.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Double Return Grille
Return Grille Double Air Brick: 18,720mm² free area (over 90% of the ducting).
Custom RAL colour air brick in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
Choice of two ducting connectors:
1) With connector for 204mm x 60mm ducting. Custom overall length (including fitted RD5FR+RD5CONN plastic Flat Channel Horizontal Adaptor 200mm D). Note: Rytons recommend 250mm in addition to the measurement from the outer leaf to the inner leaf.
2) With connector for 125mm dia. ducting. Custom overall length (including fitted RD5CONN plastic Pipe Connector 62mm D). Note: Rytons recommend 100mm in addition to the measurement from the outer leaf to the inner leaf.
Properties: A1 fire-rated 0.9mm/0.5mm galvanised steel. Fire-rated RAL colour powder coating (achieving a test result of A2-s1, d0). Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Designs 6109952 and 6109953.
Product Code: A1DK125RGD.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Double Return Grille Flanged
Return Grille Double Air Brick Flanged (15mm flange with corner screw holes): 18,720mm² free area (over 90% of the ducting).
Custom RAL colour air brick in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
Choice of two ducting connectors:
1) With connector for 204mm x 60mm ducting. Custom overall length (including fitted RD5FR+RD5CONN plastic Flat Channel Horizontal Adaptor 200mm D). Note: Rytons recommend 250mm in addition to the measurement from the outer leaf to the inner leaf.
2) With connector for 125mm dia. ducting. Custom overall length (including fitted RD5CONN plastic Pipe Connector 62mm D). Note: Rytons recommend 100mm in addition to the measurement from the outer leaf to the inner leaf.
Properties: A1 fire-rated 0.9mm/0.5mm galvanised steel. Fire-rated RAL colour powder coating (achieving a test result of A2-s1, d0). Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Designs 6109950 and 6109951.
Product Code: A1DK125RGDF.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Double Square Holed Grille
Square Holed Double Air Brick: 18,064mm² free area (over 90% of the ducting).
Custom RAL colour air brick in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
Choice of two ducting connectors:
1) With connector for 204mm x 60mm ducting. Custom overall length (including fitted RD5FR+RD5CONN plastic Flat Channel Horizontal Adaptor 200mm D). Note: Rytons recommend 250mm in addition to the measurement from the outer leaf to the inner leaf.
2) With connector for 125mm dia. ducting. Custom overall length (including fitted RD5CONN plastic Pipe Connector 62mm D). Note: Rytons recommend 100mm in addition to the measurement from the outer leaf to the inner leaf.
Properties: A1 fire-rated 0.9mm/0.5mm galvanised steel. Fire-rated RAL colour powder coating (achieving a test result of A2-s1, d0). Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Designs 6109952 and 6109953.
Product Code: A1DK125SQD.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Double Square Holed Grille Flanged
Square Holed Double Air Brick Flanged (15mm flange with corner screw holes): 18,064mm² free area (over 90% of the ducting).
Custom RAL colour air brick in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
Choice of two ducting connectors:
1) With connector for 204mm x 60mm ducting. Custom overall length (including fitted RD5FR+RD5CONN plastic Flat Channel Horizontal Adaptor 200mm D). Note: Rytons recommend 250mm in addition to the measurement from the outer leaf to the inner leaf.
2) With connector for 125mm dia. ducting. Custom overall length (including fitted RD5CONN plastic Pipe Connector 62mm D). Note: Rytons recommend 100mm in addition to the measurement from the outer leaf to the inner leaf.
Properties: A1 fire-rated 0.9mm/0.5mm galvanised steel. Fire-rated RAL colour powder coating (achieving a test result of A2-s1, d0). Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Designs 6109950 and 6109951.
Product Code: A1DK125SQDF.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Double FlowRyt® Grille
FlowRyt® Double Air Brick: 18,000mm² free area (over 90% of the ducting).
Custom RAL colour air brick in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
Choice of two ducting connectors:
1) With connector for 204mm x 60mm ducting. Custom overall length (including fitted RD5FR+RD5CONN plastic Flat Channel Horizontal Adaptor 200mm D). Note: Rytons recommend 250mm in addition to the measurement from the outer leaf to the inner leaf.
2) With connector for 125mm dia. ducting. Custom overall length (including fitted RD5CONN plastic Pipe Connector 62mm D). Note: Rytons recommend 100mm in addition to the measurement from the outer leaf to the inner leaf.
Properties: A1 fire-rated 0.9mm/0.5mm galvanised steel. Fire-rated RAL colour powder coating (achieving a test result of A2-s1, d0). Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Designs 6109952 and 6109953.
Product Code: A1DK125FRD.

Rytons A1® Fire-rated Ducting Kit 125mm Dia. with Double FlowRyt® Grille Flanged
FlowRyt® Double Air Brick Flanged (15mm flange with corner screw holes): 18,000mm² free area (over 90% of the ducting).
Custom RAL colour air brick in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
Choice of two ducting connectors:
1) With connector for 204mm x 60mm ducting. Custom overall length (including fitted RD5FR+RD5CONN plastic Flat Channel Horizontal Adaptor 200mm D). Note: Rytons recommend 250mm in addition to the measurement from the outer leaf to the inner leaf.
2) With connector for 125mm dia. ducting. Custom overall length (including fitted RD5CONN plastic Pipe Connector 62mm D). Note: Rytons recommend 100mm in addition to the measurement from the outer leaf to the inner leaf.
Properties: A1 fire-rated 0.9mm/0.5mm galvanised steel. Fire-rated RAL colour powder coating (achieving a test result of A2-s1, d0). Spot welded. Everbuild Fire Mate intumescent and acoustic sealant used on all gaps.
Registered Designs 6109950 and 6109951.
Product Code: A1DK125FRDF.

Reference Material:

  • The Building Regulations Approved Document B (Fire safety) – Volume 1: Dwellings (2019 edition). Appendix B: Performance of materials, products and structures B4. NOTE: Regulation 7(2) limits components used in or on the external walls of certain buildings to materials achieving class A2-s1, d0 or class A1 (see Section 10). Assessments cannot be used to demonstrate compliance with this requirement.
  • The Building Regulations Approved Document B (Fire safety) – Volume 2: Buildings other than dwellings (2019 edition). Appendix B: Performance of materials, products and structures B4. NOTE: Regulation 7(2) limits components used in or on the external walls of certain buildings to materials achieving class A2-s1, d0 or class A1 (see Section 10). Assessments cannot be used to demonstrate compliance with this requirement.
  • Building (Scotland) technical handbook 2019: domestic. 2.7 Spread on external walls. 2.7.1 External wall cladding. Storey height more than 11m – Where the building has a storey at a height of more than 11m above the ground the external wall cladding system should be constructed of products achieving European Classification A1 or A2.

  • Building (Scotland) technical handbook 2019: non-domestic. 2.7 Spread on external walls. 2.7.2 Specified attachments. There is a risk of vertical fire spread from specified attachments to an external wall including balconies, solar panels and solar shading. Solar shading are devices attached to an external wall to reduce heat gain within a building by deflecting sunlight. Fire-fighters may not be able to apply a water jet from a fire-fighting hose directly onto a fire that has spread onto specified attachments high above the ground.
  • Where the building has a storey at a height of more than 11m above the ground, specified attachments should be constructed of products achieving European Classification A1 or A2.
  • Extracts from NHBC Technical Extra 25.
  • Page 14: Note: in most cases, a panel of the tested system wouldn’t contain all the components necessary to function as an external wall (for example, cavity trays, weep holes, etc.). Therefore, any additional components must achieve Class A1or A2-s1, d0.
  • Page 16: Minor components within or passing through an external wall: The aim of the regulation is to remove all combustible components from, or within, an external wall.  The majority of air bricks, weep holes, ventilation ducts, etc. can be produced from materials meeting Class A1 or A2-s1, d0, so products meeting these classifications should be used.
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