Commissioned Zehnder Q350 MVHR with pre-heater by Heatspaceandlight Published 26 December 2020 at 2048 × 1532 in Cotswold new build is 55x more airtight than Building Regs and 3x more airtight than Passivhaus Commissioned Zehnder Q350 MVHR with pre-heater by Heatspaceandlight.com Next →