Each unit will provide 3,000mm2 of free airflow.

Can be used in roof spaces with rafter spacings ranging from 400mm to 600mm.

 Usually fitted retrospectively to properties with additional loft insulation recently installed, however the Felt Lap Vent will help to combat the problem of condensation build up in any roof space with a lapped felt/membrane construction.

Use the felt lap ventilatop in conjunction with other products to provide a complete roof ventilation system.