Domus Gravity Ventilation Grille - 100mm - Brown
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Product Information
Full details
The Domus 4900B Gravity Ventilation Grille is an ideal solution for homeowners and contractors seeking a reliable exterior terminal for 100mm (4-inch) ventilation systems. It provides the essential benefit of a gravity-operated shutter that automatically closes to block backdraughts when the fan is off, though users should note that the unit is specifically designed for horizontal wall mounting to ensure the shutter functions correctly.
All features
| Colour | Brown |
|---|---|
| Model Part Number | 4900B |
| Brand | DOMUS |
Extended Product Information
FAQs
Can this be used on a ceiling?
No, this is a gravity-operated grille. It must be mounted on a vertical wall so gravity can effectively close the shutter.
What size ducting does this fit?
It is designed for standard 100mm or 4-inch round ducting.
Is this grille UV resistant?
Yes, it is constructed from durable materials meant for exterior use.
How do I hide the screws?
The product features a cover or design that conceals the fixing points once the front section is snapped or screwed into place.
Will this block insects?
The gravity shutter creates a seal when closed, which helps keep out pests, though it is not a fine-mesh insect screen.
Troubleshooting
Shutter blades stay open
Check that the grille is installed perfectly level, as tilting can prevent gravity from closing the blades.
Noisy operation during high winds
Ensure the ducting behind the grille is properly supported to reduce vibrations, or consider installing a localized backdraught damper further up the duct line.
Pros and Cons
Pros
- Prevents backdraughts through gravity-closing louvers
- Concealed screw design offers a cleaner aesthetic
- Fits standard 100mm ducting perfectly
- Simple, mechanical operation requires no electricity
Cons
- Limited to wall-mounted applications
- May rattle slightly in high-wind conditions
- Color is restricted to brown
Setup, Compatibility & Care
Setup: To install, mark your drill points using the internal chassis. Ensure the unit is level so the shutter blades hang freely. Secure the grille to the wall using wall plugs and screws, then attach the front faceplate to hide the mounting points.
Compatibility: This model is strictly for 100mm (4") round ducting. It is not suitable for rectangular ducting without an appropriate round-to-rectangle adapter.
Care: To maintain performance, clean the shutter blades annually to remove grease or debris buildup that could prevent them from closing fully. Simply wipe the exterior with a damp cloth; avoid harsh solvents that could discolor the brown finish.