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Views: 0 Author: Site Editor Publish Time: 2026-09-09 Origin: Site
Modern data centers generate more heat than ever, especially with high-density servers, AI infrastructure, and GPU racks. As equipment power density increases, cooling becomes one of the biggest challenges in data center design.
A perforated raised floor panel can help solve this problem by delivering conditioned air directly into the equipment intake zone. When properly designed and positioned, perforated panels improve airflow distribution, reduce cooling losses, and support more efficient data center cooling.
But are perforated panels always the best solution? How many should you use? Where should they be installed? And how do you choose the right airflow rate and load capacity?
This guide explains how perforated raised floor panels work and how to use them effectively in modern data centers.
A perforated raised floor panel is a raised access floor panel manufactured with a series of openings that allow conditioned air from the underfloor plenum to enter the data center room.
Unlike a standard solid raised floor panel, a perforated panel functions as an air distribution point.
The basic airflow path is:
CRAC/CRAH unit → underfloor plenum → perforated raised floor panel → cold aisle → server rack intake → hot aisle → cooling unit
The raised floor therefore serves two functions:
Supporting IT equipment and other loads
Creating an underfloor space for cable management and air distribution
This combination makes raised access flooring particularly useful in data centers where underfloor cooling is part of the HVAC strategy.
Cooling a data center is not simply a matter of installing more air-conditioning capacity.
The real challenge is delivering the right amount of cooling air to the right location.
If cold air is poorly distributed, several problems can occur:
Hot spots around server racks
Uneven rack inlet temperatures
Higher fan speeds
Increased cooling energy consumption
Reduced cooling efficiency
Unused cooling capacity in low-density areas
Recirculation of hot exhaust air
This is why airflow management is just as important as cooling capacity.
A perforated raised floor panel provides a controlled pathway for conditioned air to move from the underfloor plenum into the occupied equipment area.
The main advantage of perforated raised floor panels is their ability to deliver cooling air close to the equipment that needs it.
In a traditional room, conditioned air may need to travel a relatively long distance before reaching the server rack.
With an underfloor air distribution system, conditioned air can travel through the raised floor plenum and exit through perforated panels installed near server racks.
This can reduce unnecessary airflow travel and make cooling delivery more targeted.
Not every area of a data center has the same cooling requirement.
A high-density GPU rack may require significantly more cooling airflow than a low-density storage rack.
Perforated panels allow airflow outlets to be positioned according to the actual equipment layout.
For example:
High-density rack area → higher airflow floor panels
Low-density area → fewer or lower-airflow panels
This creates a more flexible cooling strategy than treating the entire floor area uniformly.
Perforated panels are commonly positioned in or around cold aisles so that conditioned air rises directly in front of server rack air intakes.
The concept is simple:
Cold aisle = cold air supply
Server front = air intake
Server rear = hot air exhaust
This arrangement helps prevent hot exhaust air from mixing with the cold supply air.
When combined with proper aisle containment, perforated raised floor panels can become an important part of a controlled airflow strategy.
An underfloor plenum can act as a large air distribution space.
However, if airflow is not properly controlled, pressure differences and leakage can result in uneven air delivery.
Perforated panels provide defined outlet locations.
The objective is not simply to install as many perforated panels as possible. Instead, the goal is to match airflow supply with cooling demand.
The two panel types serve different purposes.
Feature | Perforated Panel | Solid Panel |
|---|---|---|
Air distribution | Excellent | None |
Cooling applications | Ideal | Limited |
Cable access | Yes | Yes |
Structural function | Yes | Yes |
Cold aisle supply | Suitable | No |
Flexibility | High | High |
Typical application | High-airflow areas | General floor areas |
A well-designed data center may use both.
Solid panels can cover areas where airflow is not required, while perforated panels can be installed where additional cooling air is needed.
This mixed-panel approach can provide better control than using perforated panels throughout the entire room.
There is no universal number of perforated panels required for every data center.
The quantity depends on several factors:
IT equipment heat load
Rack power density
Cooling unit capacity
Underfloor plenum height
Available static pressure
Panel airflow rate
Perforation design
Cold aisle configuration
Rack layout
Air containment strategy
Required server inlet temperature
For this reason, simply calculating the number of racks and adding one perforated panel per rack is not an appropriate engineering method.
The better approach is to start with the required cooling airflow and then determine how many airflow panels are needed.
A simplified cooling calculation can help explain the relationship between IT load and airflow.
For sensible cooling, a commonly used approximation is:
Q = ρ × Cp × V̇ × ΔT
Where:
Q = sensible heat load
ρ = air density
Cp = specific heat capacity of air
V̇ = volumetric airflow
ΔT = allowable temperature rise
For preliminary calculations, data center engineers may use simplified airflow formulas based on the expected heat load and temperature difference.
For example, if a server area generates a high sensible heat load, the required airflow increases as the allowable temperature rise decreases.
This is why a high-density AI/GPU zone may require significantly more airflow than a conventional server zone.
Important: Actual airflow design should be based on project-specific HVAC calculations, equipment manufacturer requirements, and computational fluid dynamics (CFD) analysis where appropriate.
The airflow capacity of a perforated panel depends on its open area, construction, pressure differential, and panel design.
There is therefore no single airflow value that applies to every perforated raised floor panel.
Manufacturers may provide airflow performance data under specified pressure conditions.
When comparing products, ask for:
Airflow rate
Static pressure
Open area percentage
Pressure drop
Airflow test conditions
Panel dimensions
Panel load rating
A panel that appears to have a large number of holes does not necessarily provide better overall cooling performance.
Airflow performance should be evaluated as a complete system rather than by hole count alone.
Even a high-performance perforated panel will not solve cooling problems if it is installed in the wrong location.
Consider a simplified layout:
CRAH → Underfloor Plenum → Perforated Panel → Cold Aisle → Server Rack
The closer the airflow outlet is to the intended server intake zone, the easier it is to control where the cooling air goes.
Poor placement can cause:
Cold air bypass
Airflow short-circuiting
Insufficient airflow at high-density racks
Unnecessary airflow in low-density areas
Higher fan energy consumption
This is why floor layout and airflow planning should be completed together.
Perforated floor panels work particularly well when combined with cold aisle containment.
Without containment, cold air can mix with hot exhaust air.
With cold aisle containment, the cooling air can be concentrated in the server intake area.
The airflow strategy becomes:
Underfloor plenum → perforated panel → contained cold aisle → server intake → hot aisle → return air
This separation can improve cooling predictability and reduce unwanted air mixing.
AI infrastructure is changing data center cooling requirements.
GPU servers can have substantially higher power densities than traditional enterprise IT equipment. As rack power increases, cooling systems must deliver more airflow or transition to other cooling technologies such as liquid cooling.
Perforated raised floor panels can still be useful in high-density environments, particularly for:
Conventional air-cooled racks
Mixed air/liquid-cooled data centers
Lower-density zones surrounding high-density racks
Network equipment areas
Storage areas
Legacy server rooms
However, extremely high-density GPU racks may exceed the practical airflow capability of conventional floor-based air cooling.
In these applications, perforated panels should be considered as part of the overall cooling architecture rather than as a standalone solution.
Yes, but the airflow function and structural function must be evaluated separately.
A perforated panel must provide adequate:
Concentrated load capacity
Uniform load capacity
Rolling load capacity where applicable
Impact resistance
Deflection performance
Pedestal support
Stringer stability
This is particularly important when deploying heavy server racks, battery systems, UPS equipment, or GPU infrastructure.
A common mistake is to select a panel based only on its airflow performance.
For data centers, you need to evaluate both:
Cooling performance + structural performance
A high-airflow panel is not automatically suitable for heavy equipment.
Perforated panels and grated panels are both used for airflow, but their applications can differ.
Perforated panels typically provide a relatively solid walking and equipment-supporting surface with controlled openings for air distribution.
Grated panels generally provide a much larger open area and can deliver significantly more airflow, depending on the design.
For many conventional data centers, perforated panels provide a practical balance between:
Airflow
Load capacity
Walking safety
Equipment mobility
Floor appearance
The correct choice depends on the required airflow and the overall raised floor design.
More airflow outlets do not necessarily mean better cooling.
Excessive open area can reduce pressure in parts of the plenum and make airflow distribution harder to control.
Installing perforated panels based only on the floor layout can create cooling imbalance.
The airflow requirement should be considered before final panel positioning.
Cables, pipes, ducts, fire protection systems, and other services can affect airflow through the plenum.
A crowded plenum may restrict airflow and create pressure variations.
Cooling performance should be evaluated together with:
CRAC/CRAH capacity
Fan performance
Plenum pressure
Rack density
Containment
Return-air configuration
Perforated panels must also support the expected equipment loading.
This is especially important for high-density server and GPU racks.
When selecting a perforated raised floor panel for a data center, consider these key specifications.
Check:
Concentrated load
Uniform load
Rolling load
Impact load
Deflection
Do not evaluate the panel independently from the pedestal and stringer system.
Ask the supplier for tested airflow performance rather than relying only on the panel's open-hole percentage.
Common raised floor constructions include:
Steel cement-filled panels
Steel hollow panels
Aluminum panels
Calcium sulfate panels
The best option depends on structural requirements, environmental conditions, airflow requirements, and project budget.
Common finishes include:
HPL
PVC
Bare steel
Ceramic
Other project-specific finishes
For data centers, the finish should also be considered in relation to static control, durability, cleaning, and replacement requirements.
The panel is only one part of the raised floor system.
The complete system includes:
Panel + Pedestal + Stringer + Adhesive/Fixing + Underfloor Structure
The weakest component can determine overall system performance.
Before purchasing, ask your raised floor supplier for the following information:
Specification | What to Check |
|---|---|
Panel size | Usually 600 × 600 mm, or project-specific |
Panel type | Perforated airflow panel |
Load rating | Concentrated + uniform + rolling load |
Airflow | Tested airflow performance |
Pressure | Test pressure / pressure drop |
Open area | Percentage of airflow opening |
Panel thickness | According to construction |
Finish | HPL, PVC, steel, ceramic, etc. |
Pedestal height | Based on project requirements |
Stringers | Light-duty or heavy-duty |
Fire performance | Project-specific requirement |
Static control | Required for IT environments |
Testing | Product/system test reports |
Perforated panels are particularly useful when:
The data center uses underfloor air distribution
Server racks are air-cooled
Cooling demand varies by rack location
Cold aisle containment is used
High-density zones require additional airflow
The raised floor is also used for cable management
Flexible airflow distribution is required
They may be less suitable as the primary cooling method when the facility relies mainly on overhead cooling or liquid cooling.
Yes—but their role is changing.
Traditional data centers often relied heavily on raised-floor air distribution.
Modern facilities increasingly use combinations of:
Raised-floor cooling
Overhead air distribution
Hot/cold aisle containment
In-row cooling
Rear-door heat exchangers
Direct-to-chip liquid cooling
Immersion cooling
As rack density increases, the cooling strategy must evolve.
Perforated raised floor panels remain valuable where underfloor air distribution is technically appropriate, particularly in mixed-density environments.
The key is not asking:
“Should I use perforated panels?”
A better question is:
“Where, how many, and at what airflow rate should perforated panels be used within my cooling strategy?”
Yes. When correctly positioned and matched to the HVAC system, perforated panels can deliver conditioned air directly into equipment intake areas and improve airflow distribution.
Conditioned air enters the underfloor plenum and exits through openings in the perforated panels. The air is then directed toward the server intake area, typically within a cold aisle.
No. Many data centers use a combination of solid and perforated panels. Perforated panels are normally concentrated in areas where cooling airflow is required.
They can be suitable for air-cooled or mixed-cooling environments, but extremely high-density GPU racks may require supplemental or liquid cooling. The required airflow and rack heat load should be evaluated before selecting the floor system.
There is no universal quantity. The number depends on rack heat load, airflow requirements, plenum pressure, panel airflow capacity, cooling-unit performance, and floor layout.
Yes. Perforated raised floor panels can be designed for different concentrated, uniform, and rolling loads. The complete panel, pedestal, and stringer system should be evaluated together.
In many raised-floor systems, panels can be repositioned or replaced. However, compatibility, airflow requirements, panel load rating, and the existing floor system should be checked first.
Choosing a perforated raised floor panel should not be based on panel price alone.
For a data center project, the supplier should understand both structural loading and airflow requirements.
For an accurate recommendation, provide:
Data center floor area
Rack quantity
Maximum rack weight
Rack dimensions
Rack power density
Required floor height
Cooling system type
Cold aisle dimensions
Required airflow
Panel load requirement
Project location
With this information, a raised floor manufacturer can recommend an appropriate combination of solid panels, perforated panels, pedestals, and stringers.
Looking for perforated raised floor panels for a data center project? Contact our technical team for panel specifications, airflow performance, load ratings, installation recommendations, and a project-specific quotation.
