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National Ventilation External Ventilation Grille - White - 100 mm

National Ventilation External Ventilation Grille - White - 100 mm

This external ventilation grille by National Ventilation is designed for efficient airflow managem...

Best current price£7.45from OnBuy.com

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National Ventilation F4904w External Ventilation Grille 100 Mm/4 Inch White C/W Flyscreen 5014662105688

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3 offers from £7.45 - £12.50

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OnBuy.comNational Ventilation F4904w External Ventilation Grille 100 Mm/4 Inch White C/W Flyscreen 5014662105688
Free delivery in 1–3 days
£7.45
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B&QB&Q - F4904W External Ventilation Grille With Insect Screen 100 mm/4 Inch (White)
Free delivery in 1–3 days
£8.80
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eBay2 x Fixed Ventilation Grille - for 4"" 100mm duct - White colour
Free delivery in 1–3 days
£12.50
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Product Information

Full details

The National Ventilation External Ventilation Grille is ideal for homeowners and installers seeking a reliable, low-maintenance terminal for 100 mm (4 inch) ventilation ducting systems. It provides an efficient solution for exhausting stale air or intake ventilation while preventing unwanted pests from entering the building through the ductwork. While it excels in durability and insect protection, the plastic construction is primarily intended for exterior wall mounting and may require specific adhesives or fasteners depending on the substrate surface.

All features

ColourWhite
Model Part NumberF4904W
BrandNational Ventilation

Extended Product Information

FAQs

Is this grille compatible with flexible ducting?

Yes, it is designed to connect to any standard 100 mm rigid or flexible ducting.

Can I paint this grille to match a different wall color?

Yes, you can use a spray paint suitable for plastics, though ensure it is weather-resistant.

Does this product come with fixing screws?

No, fixings are not included as the required type depends on your specific wall material (brick, wood, etc).

Will the flyscreen reduce the fan performance?

While any screen adds a slight resistance, this unit is designed to keep that impact to a minimum while providing essential protection.

Can this be used for cooker hood ventilation?

It is intended for general ventilation; check your cooker hood manufacturer's requirements regarding screen-less grilles if dealing with high grease content.

What is the outside diameter of the spigot?

The spigot is designed to fit inside standard 100 mm (4 inch) ducting.

Troubleshooting

Airflow seems restricted

Check the integrated flyscreen for trapped debris or heavy dust accumulation and clean as necessary.

Grille is loose or rattling

Ensure all mounting screws are tightened; if adhesive was used, re-apply a fresh bead of silicone to ensure a tight seal against the wall.

Insects are still getting through

Verify that the grille is flush against the wall; if there are gaps, use external-grade sealant to bridge the gap between the grille frame and the wall surface.

Pros and Cons

Pros

  • Integrated flyscreen prevents pest intrusion
  • Fits standard 100 mm ducting perfectly
  • Neutral design blends with most exterior walls
  • Easy to install on various surface types
  • Durable, long-lasting material

Cons

  • Plastic may become brittle after extreme long-term UV exposure
  • Does not include mounting screws in the package
  • Not suitable for heavy-duty industrial high-temperature exhaust

Setup, Compatibility & Care

Installation Steps:

  1. Measure the existing 100 mm duct pipe to ensure it extends slightly beyond the exterior wall surface.
  2. Apply a bead of silicone sealant or exterior-grade adhesive to the back rim of the grille flange.
  3. Press the grille firmly against the wall, ensuring the spigot enters the ducting snugly.
  4. Secure the grille to the wall using wall plugs and screws appropriate for your specific surface material (e.g., masonry or timber).

Care and Maintenance:

  • Periodically check the exterior of the grille for buildup of dust or cobwebs.
  • Gently vacuum or wipe the flyscreen with a soft brush once a year to ensure optimal airflow.
  • Avoid using harsh chemical cleaners, as these may damage the plastic finish.

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