An external pre-insulated MVHR duct sealed with airtightness tape – Heatspaceandlight.com Published 26 December 2020 at 2048 × 1532 in Cotswold new build is 55x more airtight than Building Regs and 3x more airtight than Passivhaus An external pre-insulated MVHR duct sealed with airtightness tape ← Previous Next →