Felt Lap Ventilator White

Felt Lap Ventilator G630

The G630 Felt Lap Vent is a refurbishment ventilation product that is fitted in traditional loft spaces to assist in overcoming the problems with condensation. This is often found in properties which have had additional loft insulation installed.

The G630 Felt Lap Vent is designed to be fitted retrospectively to existing lofts to increase the amount of ventilation into the roof spaces.

The G630 is usually fitted 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. The product can be easily installed by one person in joist openings from 400mm to 600mm wide to provide 3,000mm² of airflow per unit.



  • Can be fitted at joist centres ranging from 400mm to 600mm.

  • Easy to fit, the tapered lead in helps to slot the product between the felt laps.

  • The 3 felt clips help secure the product in place even if the edge of the felt is degraded and loose.


Felt lap ventilator G630

Felt lap ventilator G630

More Information
Brand Manthorpe
Profile Square
Material PVC
Pack Size 1
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National Plastics is a trading name of Specialist Building Products Limited, a wholly owned subsidiary of the Epwin Group Plc. Specialist Building Products Limited is registered in England & Wales. Company Registration number: 1268689. Registered Office: 1B Stratford Court, Cranmore Boulevard, Solihull, B90 4QT VAT Registration No. 864 4507 10