VB+ 805
Product Info
Dimensions (L x H x D)
x
x
mm
Unit Weight
Coverage
Packaging
Opening Area (per unit)
Opening Percentage
Notes
Product Description —
VB+ 805 is a premium concrete ventilation block with a refined double-sided finish designed for architectural screen walls and façade features. Its circular recessed opening creates a sculptural effect that introduces controlled airflow and soft light penetration while maintaining strong visual privacy.
Privacy Level
High | ●●●●○
Application
Boundary & perimeter walls, Feature & screen walls, Plant rooms & service areas, Security screening & fencing
Key Characteristics
- Fine finish on both front and back faces
- Premium off-white appearance
- Suitable for indoor & outdoor use
- Helps improve airflow and natural light penetration
- Suitable for screen walls, façades and partitions
Downloads —
CAD drawings and technical documents for specification use.
Related Products —
Alternative Options —
VentBlock (VB)
Standard ventilation block for functional airflow and screening
VBB
Premium single-face ventilation block with refined finish
Material & Technical Notes —
Important information on finish, tolerances, and natural concrete characteristics.
Finish & Colour Variation
VB+ blocks are manufactured using cement, sand and natural aggregates. As with all cement-based products, minor colour variations and tonal differences may occur between batches due to natural raw materials and curing conditions.
The blocks feature a fine off-white architectural finish on both faces, suitable for exposed installations. Slight surface texture variation is normal and contributes to the natural character of concrete products.
For the best visual consistency, it is recommended to blend blocks from multiple pallets during installation.
Efflorescence
Efflorescence is a natural phenomenon that may occur in cement-based products. It appears as a temporary white powdery deposit on the surface caused by soluble salts migrating through moisture.
This condition does not affect the structural performance of the block and typically reduces over time with exposure to weather.
Efflorescence can be removed using dry brushing or mild cleaning methods once the wall has fully dried.
Surface Protection & Sealing
VB+ ventilation blocks are suitable for both interior and exterior applications. Depending on the project requirements, a clear breathable sealer may be applied to reduce surface staining and moisture absorption.
Sealing is particularly recommended for:
Exterior façades exposed to heavy rain
Areas prone to pollution or dust
Interior spaces where easier maintenance is desired
Any applied coating should be vapour-permeable and compatible with cement-based materials to avoid trapping moisture within the block.
Always test sealers on a sample area before full application.
Dimensional Tolerance
VB+ blocks are manufactured under controlled production conditions. However, as with all precast concrete units, slight dimensional variation may occur.
Typical tolerance range follows industry standards for concrete masonry units. Minor adjustments during installation using mortar joints are expected to achieve alignment.
Handling & Installation
VB+ blocks should be handled carefully to avoid edge chipping or surface damage during transportation and installation.
During installation:
Ensure proper mortar bedding and alignment
Maintain consistent joint spacing
Protect installed blocks from excessive impact or contamination during construction
Where blocks are installed as exposed architectural elements, careful workmanship is essential to achieve the desired visual quality.
Structural Consideration
VB+ ventilation blocks are non-load-bearing architectural units designed primarily for ventilation screens, feature walls, and partitions.
They should not be used as structural elements unless incorporated within a properly designed structural system by a qualified professional.