M Series High-Performance Fan Filter Units
The M Series represents the pinnacle of airflow precision for controlled environments. These variable-speed HEPA units are engineered to clean and pressurize air with maximum energy efficiency and a low-profile footprint.
Filtration & Air Quality
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Dual-Stage Filtration: Each unit includes a 30% ASHRAE pleated pre-filter to capture large particles, extending the life of the primary filter.
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High-Efficiency Final Filter: The standard HEPA filter is 99.99% efficient at 0.3 microns. For more stringent requirements, an ULPA grade (99.9995%) filter is available as an optional upgrade.
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Certified Protection: All final filters are protected by a white epoxy diamond-pattern grille and tested to IEST and ISO standards.
Advanced Motor Technology
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Energy Efficient N310 Blower: Features a low-watt, backward-curved impeller for high-output performance with minimal power consumption.
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Reliable Operation: The single-phase, permanent split capacitor motor includes thermal overload protection for long-term safety.
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Versatile Power Options: Available in 115V (60 Hz), 208-230V (50/60 Hz), and 277V (60 Hz) configurations.
Performance Metrics
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Variable Airflow: * 2′ x 4′ Units: 400 to 750 CFM (Nominal 632 CFM at 90 FPM).
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Ultra-Quiet Operation: Sound levels average 54 dba at 90 FPM face velocity (measured 30” from the filter face), ensuring a comfortable work environment.
Design & Installation
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Low-Profile Footprint: With a total height of only 12-5/8”, these units are ideal for facilities with limited plenum space.
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Standardized Fit: Designed to integrate seamlessly into a nominal 2’ x 4’ ceiling grid with a standard 22.5” x 46.5” opening.
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Durable Housing: Anodized aluminum frames provide a lightweight yet rigid structure resistant to corrosion.
Why Choose Variable Speed?
Unlike standard models, the Variable Speed M Series allows facilities managers to fine-tune airflow to exact specifications. This is critical for:
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Compensating for filter loading over time.
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Meeting specific air change per hour (ACH) requirements.
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Optimizing energy usage across large-scale cleanroom grids.
Choosing the Right FFU: M Series vs. Q Series
While both series are designed to provide high-efficiency HEPA filtration and maintain positive pressure, the primary difference lies in the airflow capacity and how you control that airflow.
| Feature |
M Series (Three Speed) |
Q Series (Variable Speed) |
| Motor Control |
Solid-State Variable Speed: Allows for “dial-in” precision of airflow. |
Three-Speed Switch: Offers High, Medium, and Low presets. |
| Airflow (2′ Χ 4′) |
400 to 750 CFM (632 Nominal @ 90 FPM) |
340 to 640 CFM (510 Nominal @ 90 FPM) |
| Best For |
Precise ISO Class requirements and higher air change volume. |
Standard applications and budget-conscious projects. |
| Profile |
Low Profile: 12-5/8” high (all models). |
Low Profile: 12-5/8” high (all models). |
| Flexibility |
Highest. Fine-tune CFM to compensate for filter loading over time. |
Moderate. Reliable performance using set speed intervals. |
| Adjustability |
Infinite adjustment between minimum and maximum CFM. |
Step through three distinct performance tiers. |
Which one do you need?
Select the M Series if:
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You require higher air volume; the M Series delivers ~24% more nominal CFM than the Q Series.
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You are building a room that requires exact air change rates to meet strict ISO certification.
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You want the ability to precisely balance a Ceiling Grid with multiple units to ensure uniform airflow.
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You need a low-profile design for tight plenum spaces (both units share this advantage).
Select the Q Series if:
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You need a dependable, “set-it-and-forget-it” filtration solution.
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Your application is less sensitive to minor fluctuations in CFM.
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You are looking for a cost-effective way to pressurize Modular Softwall Clean Rooms.
Expert Advice: Not sure which motor configuration is right for your square footage? Our team can help you calculate the necessary Air Changes Per Hour (ACPH) and recommend the unit that ensures your room stays within compliance. Contact us for a technical consultation.
Your Vision, Our Expertise
Designing a clean room is about more than just buying the right filters—it’s about creating a controlled environment that meets rigorous ISO standards and operational goals. At Bennett and Bennett, we don’t just sell equipment; we provide the technical guidance necessary to ensure your facility performs exactly as required.
Whether you are installing a Modular Softwall Clean Room or a Ceiling Suspended system, our team is here to help you:
- Determine Class Requirements: We help you navigate ISO 1 through ISO 8 specifications to find the right balance of airflow and filtration.
- Custom Layout Design: We assist in selecting the right Grid Systems and Ceiling Panels to maximize space and efficiency.
- Optimize Airflow: Utilizing high-performance Fan Filter Units, we calculate the exact CFM needed for your square footage.
Need a technical consultation? Contact our experts today to discuss your project specifications and ensure your build meets all required standards.
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