220mm x 90mm Kair Fast Seal Duct To Duct Quick ConnectorManufactured from rigid white HIP plastic (High Impact Polystyrene).It has a minimum free area of 16,790 mm2 (Duct Side) to 17,968 mm2 (Fitting Side).The Kair System 220 Fast Seal Duct to Fitting Connector is fully compliant with SAP Appendix Q Product Characteristics Database recommendations for duct sizes used with both extract and Mechanical Heat Recovery Systems.The Kair System 220 Fast Seal Duct to Fitting Connector is manufactured in compliance with Domestic Plastic Ductwork Specification DW/154 and does meet UL94HB flammability standard. It has been designed for use with the full Kair System 220 range.The New and Innovative Kair Fastseal system removes the need for sealant and tape by ensuring that the air leakage in and out of the ducting joint is kept to an absolute minimum. This unique design provides consistent joint quality and integrityFaster InstallationIt significantly reduces installation time and can be removed or re-made for alteration, maintenance and cleaning.In particular, new housing constructions are so airtight that mechanical ventilation is often deployed to ensure sufficient air changes in the building to provide hygienic, comfortable living, whilst minimising condensation.No more sealant or tapeEliminates the need to seal joints with silicon sealant or duct tape Simple Push-Fit assembly Withstands both positive and negative pressure Fastseal incorporates a uniquely shaped gasket Independently tested by the Building Research Establishment A New and innovative approach to reduce ducting system leakage.