Rigid Thermal Ducting – 160mm

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160mm rigid thermal ducting for MVHR, mechanical extract ventilation systems, and heat pump water heaters where heat retention and airtightness are non-negotiable. This collection features Verplas Self-Seal Thermal ducting in 160mm diameter — straight lengths, 45° and 90° bends, T-pieces, and duct-to-duct connectors — all forming part of the same award-winning push-fit system. The 160mm bore is the standard choice for whole-house MVHR central trunk runs, higher-flow mechanical extract applications, and the air intake and exhaust connections on integrated heat pump water heaters. MVHR and mechanical ventilation The 160mm bore is appropriate for central MVHR trunk runs and main extract branches where 125mm ducting would create unacceptable resistance. Uninsulated ductwork running through cold loft spaces, undercroft voids, or unheated service zones loses a significant proportion of the heat it is meant to recover. Verplas Thermal ducting is manufactured from Neopor® graphite-impregnated EPS, achieving a thermal conductivity of 0.03 W/mK — which at 20mm wall thickness delivers a thermal resistance (R-value) of 0.666 m²K/W. This exceeds the minimum 0.625 m²K/W threshold specified by the Part F 2010 Domestic Ventilation Compliance Guide and NHBC Chapter 3.2, and satisfies the requirements of DW/143 Class A for duct airtightness. The insulation also prevents condensation forming on or inside the duct — a common failure mode in rigid systems routed through cold zones. Heat pump water heaters Integrated heat pump water heaters — also referred to as heat pump cylinders or air-to-water DHW heat pumps — typically require two 160mm duct connections: one for ambient air intake and one for cooled exhaust air. Models from manufacturers including Dimplex, Vaillant, and Ariston specify 160mm ducting for these connections, and manufacturers typically publish maximum permissible system pressure drops that must be calculated from the number of straights, bends, and terminations in the