Nullifire Intusleeve PVC Duct Closer


We no longer stock this product, but can recommend Nullifire FP220 Service Sleeves as a great alternative.

Product not available
This Product has been Discontinued


Length of sleeve is relative to the width of the wall and the seal. This should be specified when placing an order. 220 x 90 mm duct requires a minimum 250 mm length of the sleeve.

Ordering References

Order Ref Item Size
366171 Intusleeve PVC Duct Closer 110 x 54 x 140 mm
366173 Intusleeve PVC Duct Closer 204 x 60 x 140 mm
366174 Intusleeve PVC Duct Closer 220 x 90 x 250 mm
366175 Intusleeve PVC Duct Closer 225 x 25 x 140 mm
366177 Intusleeve PVC Duct Closer 300 x 25 x 140 mm

Intusleeve seals around plastic ventilation ducting passing through fire barriers and fire compartment walls, with its intumescent lining crushing heat-softened pipes in fires and filling the void to prevent the spread of smoke and fire. The metal duct sleeves fix around ducting and slide into compartment walls, protecting voids and cavities for up to 120 minutes.

Nullifire Intusleeve PVC Duct Closer is an economical solution for fire sealing combustible ducting penetrations, completely protecting the cavity within stud work walls, and can be retro-fitted to existing ducting.


  • Seals around plastic ventilation ducting
  • Ultra-slim body design ensures easy installation in awkward situations
  • Intumescent lining crushes heat-softened pipes in fires
  • Prevents the spread of smoke and fire
  • Protects voids and cavities for up to 120 minutes
  • Fully tested at BM TRADA to 2 hours integrity and insulation


  • Open Intusleeve Duct and fit around the duct. Replace lid.
  • Push Intusleeve through the compartment wall ensuring equal overhang each side.
  • Seal in place using Intumastic or ADL sealant in gaps up to 20 mm. Larger openings may be sealed with Intubatt.
  • Annular spaces up to 60 mm may be packed using a minimum 60 mm depth 64 kg rock fibre.

Length of sleeve is relative to the width of the wall and the seal. This should be specified when placing an order. 220 x 90 mm duct requires a minimum 250 mm length of the sleeve.


Building Regulations 2000 Approved Document B states that all plastic pipes over 40 mm should be provided with a proprietary sealing system which has been shown by tests to maintain the fire resistance of the wall. Firetherm Intusleeve complies with these requirements.

Fire Testing

Tested at Exova BM Trada to BS EN 1366-3 and BS 476 Pt 20-22, 120 minutes EI

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and Conditions and should be applied only by an individual with the necessary expertise and experience. We will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.

Product Details

Data sheet


Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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