Minimum free area of 16,790mm² (duct side) to 17,968mm² (fitting side)
The Self Seal Coupler incorporates a gasket to reduce air leakage to an absolute minimum in connections between length of FD220 duct and FD220 fitting
Fully compliant with SAP Appendix Q Product Characteristics Database recommendations for duct sizes used with both extract and Mechanical Heat Recovery Systems
Manufactured in compliance with Domestic Plastic Ductwork specification DW/154 and does meet UL94HB flammability standard
