Vertiv FOAMBLOCK 24" x 24" Perforated Data Center Airflow Block Foam
Overview
The Vertiv FOAMBLOCK is a 24" x 24" high-density foam panel, perforated on a 1" x 1" grid, sold in packs of six sheets. Its purpose is precise: seal the gaps that let hot exhaust air recirculate back into the cold aisle, undermining your cooling efficiency and driving up compute temperatures. In data center cabinet accessories, few interventions deliver as fast a return as plugging bypass airflow paths — and the FOAMBLOCK is the practical tool to do it at scale across a cabinet row or a raised-floor environment.
Data centers lose a significant portion of cooling capacity not to insufficient CRAC output, but to conditioned air escaping through unsealed floor cutouts, cable pass-throughs, and unused rack spaces before it ever reaches equipment inlets. FOAMBLOCK panels give facilities and IT teams a cost-effective way to address those leakage points without specialized tools or extended downtime.
Key Features
- 24" x 24" panel size: Matches standard floor tile and ceiling cut-out dimensions common in raised-floor data centers, reducing the need to cut or stack panels to cover openings. Fewer seams mean fewer leakage paths.
- 1" x 1" perforated grid: The perforation pattern lets you tear out precisely what you need — fill a 3" cable pass-through, a 6" floor cutout, or an irregular gap around a conduit without cutting tools. Pull apart only what you need and press the remainder back into service elsewhere.
- High-density foam construction: Denser foam resists compression set over time. Panels pressed into tight cable openings or under floor tiles won't gradually thin out and reopen the bypass path you just sealed — an important factor for installations you won't revisit monthly.
- UL94 flame-rated material: UL94 is the standard test for plastic flammability. Materials meeting this rating self-extinguish in defined burn tests, a baseline requirement for anything installed in an energized equipment environment or a space with fire suppression obligations. Facilities managers and AHJs frequently require this documentation for data center materials.
- Versatile sealing applications: Use the FOAMBLOCK panels inside cabinets to block unused U-spaces and cable routing gaps, at the floor level around cable cutouts, or at ceiling penetrations where conditioned air escapes upward. One SKU addresses multiple gap types across the same facility.
- Pack of 6 sheets: A single FOAMBLOCK order provides six 24" x 24" panels — enough to address multiple floor tiles or several cabinet rows without requiring per-panel ordering. For larger deployments or ongoing facilities work, the pack format reduces procurement friction.
Integration & Compatibility
The FOAMBLOCK panels integrate into any cabinet or raised-floor environment without proprietary hardware or mounting systems. They work alongside aisle containment systems — hot-aisle/cold-aisle containment reduces the pressure differential that drives bypass airflow, while foam blocking seals the remaining low-resistance paths. Used together, the two approaches are more effective than either alone.
For deployments using Vertiv data center racks and cabinets, the 24" x 24" panel size aligns with common Vertiv rack accessory dimensions, simplifying coverage planning. The tear-apart perforation grid accommodates virtually any irregular cable bundle or conduit geometry encountered in the field.
The panels are also suitable for sealing openings in non-raised-floor environments: wall penetrations, ceiling spaces, and horizontal cable trays where unconditioned air can enter the equipment room. Any gap that creates a pressure bypass is a candidate for foam blocking.
Frequently Asked Questions
Q: What is the UL94 flame rating on the FOAMBLOCK, and why does it matter for data center use?
A: UL94 is the Underwriters Laboratories flammability standard for plastic materials. Materials rated UL94 self-extinguish within defined parameters when exposed to a flame source. For data center accessories installed in proximity to energized equipment, many facilities policies and local codes require UL94-rated materials — it is a baseline fire safety requirement that simplifies approval with facilities managers and inspectors.
Q: Can I cut the FOAMBLOCK panels to fit irregular gaps, or do I need tools?
A: The 1" x 1" perforated grid is designed so you can pull apart panels by hand without cutting tools. Tear out only the area needed to accommodate a cable bundle or conduit and press the remaining foam into the surrounding gap. For non-standard shapes, standard utility knives work cleanly on the high-density foam.
Q: How many sheets are included in one FOAMBLOCK order?
A: One FOAMBLOCK purchase includes a pack of 6 sheets, each measuring 24" x 24". That provides up to 24 square feet of sealing coverage before any tear-outs, sufficient for several floor tile cutouts or multiple cabinet gap locations.
Q: What gaps can I seal with the FOAMBLOCK beyond standard rack U-spaces?
A: The manufacturer lists floor cutouts, ceiling penetrations, and general data center gaps — anywhere bypass airflow or recirculation occurs. The panels are not limited to cabinet interiors; raised-floor cable openings and wall/ceiling conduit penetrations are also valid application points.
Q: Is the FOAMBLOCK compatible with hot-aisle/cold-aisle containment systems?
A: Yes — foam blanking panels and containment systems address complementary problems. Containment reduces overall bypass pressure; foam sealing addresses residual low-resistance leakage paths that containment alone does not close. The two approaches are typically deployed together in higher-density environments.
Q: Does the FOAMBLOCK come in sizes other than 24" x 24"?
A: The FOAMBLOCK SKU specifies 24" x 24" panels. Contact a pre-sales specialist to confirm whether additional sizes are available for your facility's specific floor tile or cutout dimensions.
The FOAMBLOCK is one of those products that looks trivial on a spec sheet but matters a great deal on the raised floor. The 1" x 1" perforation grid is the functional detail I always point to — it means a technician can tear off exactly what they need to wrap a 2" conduit or plug a 4" floor gap without scissors or a utility knife, which matters when you are working in a live environment and need to move quickly. I have seen facilities where unsealed floor cutouts alone accounted for 15-20% of conditioned air bypass — foam blocking is one of the fastest ROI interventions available.
Technical Highlights:
- UL94 Flame Rating: Required for most enterprise and colo facilities that have fire suppression systems or local codes governing materials in the raised floor plenum. Having the documentation on hand for the AHJ or facilities audit is worth the spec confirmation upfront.
- 24" x 24" Panel Geometry: Sized to align with standard 24" floor tiles. A single panel covers one full tile cutout with no waste, or two to three smaller cable pass-throughs per panel depending on bundle diameter.
- High-Density Foam: Resists compression set in tight cable openings. Thin or low-density foam compresses down over time and reopens the bypass path — defeating the purpose of sealing in the first place. High-density is the right material for a permanent installation.
Deployment Considerations:
- Plan the seal sequence before ordering: map every floor cutout, ceiling penetration, and cabinet gap in the affected row, estimate square footage, then divide by 4 sq ft per panel (accounting for tear-outs) to size your FOAMBLOCK order. A pack of 6 covers up to 24 sq ft at full panel, less with cutouts.
- The FOAMBLOCK is not a substitute for blanking panels in open rack U-spaces — foam is for irregular gaps and penetrations, not for structured rack blanking where 1U and 2U solid blanks are the appropriate tool. Use both, not one or the other.
For a colocation provider or enterprise data center undergoing a thermal efficiency audit, deploying FOAMBLOCK panels at all raised-floor cable cutouts — combined with proper aisle containment — is the right sequence. Seal the bypass paths first, then measure; most facilities find CRAC setpoint adjustments become possible only after the foam sealing is complete.
