90mm diameter MVHR ducting fitted into a radial manifold in a low energy Home – Heat Space and Light Ltd 2022 Published 12 June 2022 at 1028 × 538 in Early construction forensic air pressure test improves new building’s fabric air permeability by 50% 90mm diameter MVHR ducting fitted into a radial manifold in the loft area. 90mm diameter MVHR ducting fitted into a radial manifold in the loft area. ← Previous