• Type: Ducted
• Material: Powder-Coated Steel
• Filter Replacement Access: Top Side
• Size: 2'x4'
• Filter Frame Material: Aluminum
• Filter: HEPA
• Motor Type: None
• Airflow: Positive Pressure
• Unit of Measure: EA
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Laminar Flow Diffuser with HEPA Filter, Ducted, 2'x4', WhisperFlow
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Terra Part #: 6601-24-HD
Manufactured By: Terra Universal
Warranty: 1 year parts, 90 days labor
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55504
Laminar Flow Diffuser with HEPA Filter, Ducted, 2'x4', WhisperFlow
• Includes 12”-diameter x 2”H collar for connection to air supply; Airflow performance depends on flow of supplied air handler
• 1/4-20 UNC threaded inserts in top corners, accommodate eyebolts to facilitate installation using suspended guy wires (order eyebolt package separately)
• Includes FDA-approved silicone sealant (specify acrylic urethane or other Required sealant type when FFU is ordered)
• Purchase optional Challenge Port Kit separately
• Filter: 99.99% efficient High-Efficiency Particular Air, rated at particles 0.3µm diameter
• Because filters are delicate and subject to damage during handling, all filter sales are final; no failure claims can be accepted
• Type: Ducted
• Material: Powder-Coated Steel
• Filter Replacement Access: Top Side
• Size: 2'x4'
• Filter Frame Material: Aluminum
• Filter: HEPA
• Motor Type: None
• Airflow: Positive Pressure
• Unit of Measure: EA
• Electrical Specifications: None
• Weight, Product: 71 Lbs
• Dimensions, Product: 23.63" W x 47.63" D x 11.17" H
• Weight, Shipping: 91 lb
• Dimensions, Shipping: 53"W x 53"D x 20"H
• Package Type: Palletized
Manuals & Resources
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Fan Filter Units
Terra Universal WhisperFlow® Filter Fan Units- Ducted HEPA Filter Unit, 2' x 4'
Overview video of Terra Universal's comprehensive portfolio of filter fan units Terra Universal WhisperFlow® Filter Fan Units Overview video of Terra Universal's comprehensive portfolio of filter fan units
Ducted filter unit provides uniform flow of HEPA- or ULPA-filtered air to an enclosure (requires remote air handler) | 6601-24-HD displayed Ducted HEPA Filter Unit, 2' x 4' Ducted filter unit provides HEPA- or ULPA-filtered air to an enclosure (requires remote air handler). WhisperFlow baffling system ensures uniform face velocity (2 x 4 model shown).
Features and Benefits
Protect Against Contaminants and Pathogens
HEPA and ULPA filters help capture many bacteria, viruses (COVID-19), and mold spores that contribute to a host of infections for both humans and plant/animal tissue cultures
Long Running FFU Motors
Terra’s filter fan unit motors are rated for 5 years of continuous, 24/7 operation, if the HEPA filters are consistently replaced. To accurately monitor your HEPA filter’s saturation levels, purchase Terra’s audible and visual filter replacement alarm system.
Continuous Product Improvement
At Terra, we strive to develop and produce the highest quality products for our customers to improve health, safety, performance, and yields. Our product quality is enabled by high-grade manufacturing equipment and processes, 45 years of engineering and application expertise, and our commitment to continuously improve.
Comprehensive Product Portfolio
Terra’s comprehensive product portfolio includes solutions for every application and budget. Our technical sales staff will guide you toward the product most suitable for your requirements.
Long-Term Customers
Terra is committed to building long-term relationships with satisfied clients; 94% of orders each year come from repeat customers
Complete Order Transparency
Using Terra’s OnTrak system, our customers can view real-time production updates, receive shipment notifications and track their orders until they arrive at their facility
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
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Ionizing Bar; 22"L, with Installation Kit, for 24 x 24 Fan/Filter Unit
Ionizing bar, mounted to Fan/Filter Unit, provides a balanced stream of ions to the work area below to neutralize static charge and prevent electro-static discharge; 22" bar shown installed on 2' x 2' FFU. -
Filter Unit Mounting Frame; Stainless Steel, 2' x 2'
Stainless steel Fan Filter Unit (FFU) mounting frame supports FFU on drywall or other rigid ceiling material, viewed from above ceiling panel (FFU not included). -
Filter Replacement Alarm
The filter replacement alarm monitors filter backpressure and issues an alarm when filter needs replaced (requires selection of fan filter unit with challenge port, order separately). -
Challenge Port for Fan Filter Unit
Challenge port for Fan/Filter Units simplifies filter leak testing and connection of Filter Backpressure Alarm (shown with optional pressure gauge; must be ordered with FFU). -
Safely Mount FFU’s Above Floor for Horizontal Laminar Airflow
The portable FFU base stand can be easily positioned to supply Class 100 horizontal laminar flow into a room or enclosure. It can also be positioned next to sensitive equipment/materials that are mounted close to the floor.
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