90mm semi-rigid ducting in webbed joists and passing through core-drilled blockwork wall for MVHR system – Heat, Space and Light Ltd 2021 Published 9 August 2021 at 1600 × 1200 in 90mm semi-rigid radial MVHR ducting installation in London deep energy retrofit 90mm semi-rigid ducting in webbed joists and passing through core-drilled blockwork wall 90mm semi-rigid ducting in webbed joists and passing through core-drilled blockwork wall for MVHR system ← Previous