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Addressing a Common Specification Question
Engineers and facility managers evaluating air terminal devices frequently ask whether aluminum ventilation grilles can be fitted with volume dampers to balance airflow across a system. For Meridel's range of supply air and extract air grilles, the answer is clearly yes. The product architecture is built specifically around modular attachments that allow volume flow rate balancing without compromising the grille's core function of directing air into comfort zones and industrial zones.
Why Volume Flow Rate Balancing Matters
In ventilation and air conditioning systems, multiple grilles are often connected to a single volume flow controller. Without a method to fine-tune the discharge at each outlet, rooms served by the same duct run can receive uneven airflow, leading to comfort complaints or inefficient conditioning. Meridel's product line addresses this pain point directly through purpose-built duct attachment kits and damper units that are designed to integrate with its ventilation grilles, including models such as ASL, AT, VAT, AH, AHR, AF, and WAP.
Damper Attachments Built for Grille Integration
Meridel offers a dedicated family of attachments made of sheet steel that mount directly onto its grilles to provide both volume flow rate balancing and air direction control:
- -AG: A damper unit with opposed action blades for volume flow rate balancing. The blades can be adjusted and set with screws, and critically, this adjustment can be performed without removing the ventilation grille—a feature that simplifies commissioning and ongoing maintenance.
- -AS: A hit and miss damper unit for volume flow rate balancing, featuring adjustable blades that are secured with a locking screw once the desired setting is reached.
- -D: An air direction control attachment for supply air, with air control blades fitted at 90 degrees to the front blades. This allows airflow direction to differ from the front blade orientation, and like -AG, it can be adjusted without removing the grille.
- -DG: A combined solution that pairs opposed action blades for volume flow rate balancing with adjustable air control blades fitted at 90 degrees to the front blades. This dual function allows installers to balance volume flow and fine-tune discharge direction in a single attachment, again without needing to dismount the grille.
For Type AT grilles, technical dimensions are specified precisely: the -AG and -DG attachments measure T = 70 mm, T1 = 11 mm, and T2 = 92 mm, while the -D attachment measures T = 28 mm, T1 = 11 mm, and T2 = 50 mm. These exact figures give specifiers confidence that the attachments will fit within defined installation clearances.
Standalone Duct Attachment Kits
Beyond attachments mounted directly to the grille face, Meridel also provides dedicated duct attachment kits for volume flow rate balancing when several grilles share one volume flow controller:
- AGW: A damper unit with opposed action blades, adjustable.
- ASW: A damper unit with a hit and miss damper, adjustable, and secured with a locking screw.
- DGW: A duct attachment kit for volume flow rate balancing.
These kits extend balancing capability into the ductwork itself, giving engineers flexibility in deciding whether to balance airflow at the grille or further upstream in the duct system.
Volume Flow Control Within the Plenum Box
For Type AT grilles connected via ductwork, Meridel's AK-AT plenum box offers additional damper options that support airflow balancing at the connection point. Damper types available include a perforated spigot damper (M), a cord operated spigot damper (MC), an opposed blade VCD fitted to the plenum (AGP), deflection blades fitted to the plenum (DP), and a combined opposed blade VCD plus deflection blades (DGP). This range means that whether a project requires balancing at the grille, in the duct, or at the plenum, Meridel's system architecture accommodates it.
Engineered for Real-World Performance
These damper and attachment options are matched to grilles built from aluminum construction with a powder-coat finish, available in P3 RAL 9010:20% or P6 RAL CLASSIC colors at gloss level 30%. Nominal sizes range from 150 x 100 mm to 1200 x 600 mm, and the system supports volume flow rates from 13 to 2170 l/s (47 to 7812 m³/h). The minimum volume flow rate spans 13 to 965 l/s (47 to 3474 m³/h), while the maximum volume flow rate at LWA max. 40 dB(A) without attachments ranges from 54 to 2170 l/s (195 to 7812 m³/h). Supply air to room air temperature differences of -12 to +4 K are supported, reflecting suitability for mixed flow ventilation in both comfort and industrial settings. Sound power levels of air-regenerated noise are measured according to EN ISO 5135, giving specifiers a verifiable acoustic benchmark when selecting damper configurations.
Installation Support for Damper-Equipped Grilles
Fitting a grille with a damper attachment does not complicate installation. Meridel's installation subframes—including ER, EF, B20, B30, L20, and L30—are designed to work alongside attachments such as -AG, -AS, -D, -DG, -RD, -RS, -R5, -KD, -KS, and -K5, enabling fast and simple mounting into walls, sills, rectangular ducts, circular ducts, floors, or doors. For projects requiring pre-sales sizing, Meridel's Easy Product Finder allows engineers to size the correct grille and attachment combination using project-specific data before specification is finalized.
Maintenance and Long-Term Reliability
Once installed, damper-equipped grilles remain accessible for ongoing commissioning adjustments. Because both the -AG and -D style attachments are adjustable without removing the grille, facility teams can rebalance airflow as occupancy or usage patterns change, without disrupting the ceiling, wall, or floor finish. Inspection and cleaning guidance is provided according to VDI 6022, supporting consistent indoor air quality over the service life of the installation.
Conclusion
For specifiers asking whether aluminum ventilation grilles can accommodate volume dampers for airflow balancing, Meridel's product architecture provides a direct and well-documented answer. Through attachments such as -AG, -AS, -D, and -DG, standalone duct kits like AGW, ASW, and DGW, and plenum box damper options within the AK-AT line, Meridel supports volume flow rate balancing across multiple installation points—at the grille, in the duct, and at the plenum—while maintaining the adjustable discharge direction, durable aluminum construction, and flexible installation methods that define its ventilation grille range.
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