Where additional ventilation is required in a roof space, perhaps as a result of introducing insulation, the use of soffit ventilators should be avoided and a more discreet method used.
Os oes angen awyriad ychwanegol mewn gofod to, o ganlyniad i'w inswleiddio efallai, dylech osgoi awyryddion soffit a defnyddio dull llai amlwg.