• Hood Design: Benchtop
• Frame Material: 304 Stainless Steel
• Light Fixture: Fluorescent Illuminator
• Manufactured by: Terra Universal
• Model: Exhaust Fume
• Number of Blowers: 3 Blowers
• Side Panels: Acrylic
• Sash Design: Manual/Tilt-Up
• Type: Ducted
• Work Area Dimensions: 42" W x 29" D x 28" H
• Inside Width: 42"
• Inside Depth: 29"
• Inside Height: 28"
• Unit of Measure: EA
Activated charcoal, the most common purification filtration medium, adsorbs chemicals with a molecular weight above 30 and a boiling point above 60°C. Carbon filters are also effective with many other chemicals because of their particular molecular structure.
Adsorption takes place in the active filter zone, the small cross-section of the filter bed in which the material to be removed comes in contact with the filtering medium. This active filter zone moves upward as the filter becomes saturated (see illustration). When it reaches the filter's top surface, there is an initial breakthrough by the contaminant gas; thereafter the percentage of contaminant gas that escapes filtration increases until total saturation of the filter is reached.
Ductless fume hoods manufactured by Terra use activated carbon filters to eliminate most nuisance fumes and can be used in conjunction with HEPA filtration. For more hazardous chemicals like strong acids and bases, specialized Labconco filtered fume hoods can be equipped with a wider range of filters and include an array of safety sensors for breakthrough detection.
To optimize filtration efficiency, any ductless exhaust fume system must ensure that the exhaust stream is exposed to the purification medium for an adequate time. Terra exhaust purification systems satisfy this condition in several ways.
First, our specially selected impeller ventilators are designed to ensure the optimal linear velocity of the airstream—sufficient to maintain a negative pressure in the work area that prevents backflow, but low enough to allow adequate adsorption of fumes by the filtering medium. Our pre-filters also extend exposure time by reducing the airflow through the filter.
A ductless exhaust fume system needs to be monitored in two areas. The user must detect the period between initial contaminant breakthrough and the point at which the contaminant gas reaches the Threshold Limit Value (TLV) for that substance. The velocity of the airstream must also be monitored to ensure an adequate negative pressure and to detect ventilator failure.
Through periodic testing of the exhaust airstream, you can determine the useful filter life in your particular application and gauge filter effectiveness with an elapsed time meter.
An electronic airflow velocity monitor also helps users ensure safe, effective operation and provides an alarm when velocity falls below a user-defined threshold.
Avoid filter use in applications involving very toxic substances, very high volumes of contaminants, and unknown or highly volatile chemical reactions. Always make sure that filters are promptly changed when the Threshold Limit Value (TLV) has been reached for any contaminant gases present.
Labconco Protector XL ValuLine® Ductless Fume Hoods with Exit Filter Housing Benchtop Ductless Fume Hood Labconco Protector ClassMate Labconco Xpert Balance Enclosure – 8 ft Labconco Xpert Nano Ductless Exhaust Hood Labconco Protector XVS Ventilation Stations Labconco Protector® Echo – Floor Mounted Powder-Coated Explosion-Proof Ductless Fume Hood Multi-Suite ISO-Rated Hardwall Modular Cleanroom Protector XStream Laboratory Fume Hoods by Labconco Hoods
Labconco’s Protector XL Series of oversized fume hoods provides significantly more space for working or storage without compromising safety.
Terra’s ValuLine® Fume Hood provides economical fume removal using carbon filtration inside; shown with optional final HEPA-filtration housing on top.
Terra’s Benchtop Ductless Fume Hood offers a comfortable, sloped sash for better visibility of the workspace.
Labconco’s Protector ClassMate Series of fume hoods has a glass rear panel and sides for total visibility of the work area, ideal for educational labs.
Labconco’s Xpert Balance Enclosures can be customized to provide additional workspace and conveniences, such as bulk API access and waste ports.
Labconco’s Xpert Nano Series of ductless exhaust hoods features an ULPA filtration system for the highest level of protection against nanoparticulates.
Labconco’s Protector XVS connects to an in-house exhaust system for rapid removal of fumes from the classroom or lab.
Labconco manufactures large, floor-mounted fume hoods that can accommodate entire carts full of fume-producing materials.
NEC Class I, Division 1-compliant explosion-proof fan ventilates fumes through carbon filters for safe indoor release (for use with non-hazardous fumes; order work surface and vapor-sealed or explosion-proof light separately)
Economical modular designs accommodate complex floorplans, ideal for multiple cleanroom suites with cascading pressures and ISO cleanliness levels.
High-performance, low-volume and energy efficient benchtop with Upper Dilution Air Supply, Clean-Sweep™ Sash Handle, Rear Downflow Dual Baffle System, Opti-Zone™, Eco-Foil™ Air Foil.
These Environmental Control Modules address a central cleanroom dilemma: high-technology equipment requires smaller geometries (and more stringent environmental standards), while the necessary cleanrooms become increasingly expensive to construct and maintain.
In fact, research suggests that particles in the sub 0.1 micron range, which can degrade today’s most sensitive components, are largely unaffected by cleanroom laminar flow airstreams. The disturbing consequence of these findings is that many submicron particles—once they are introduced into a cleanroom—may be nearly impossible to remove, even with sophisticated HEPA filtering systems. At the heart of this problem are humans themselves— by far the greatest source of contamination in a cleanroom.
Isolated controlled-air environments provide a cost-effective solution to this problem. Once an operator is removed from the processing or storage area, maintaining superclean conditions becomes much easier—and much more affordable!
Terra’s Environmental Control Modules provide a versatile, economical approach to this mini-environment concept.
Their design flexibility allows you to construct a laminar flow or exhaust purification/removal system for virtually any sized enclosure. Hoods are available for use with two, three, or four filter/blower modules, and several hoods of any size can be positioned together to form as large a work station as you need. Blower/filter modules attach securely to hoods by means of a few screws, and gaskets ensure an air-tight seal.
Further, blower/filter modules can be wall mounted to provide continuous filtering/recirculating, or operated as free-standing systems to deliver a continuous supply of Class 10 air (or purified exhaust) to a remote benchtop or enclosure.
The low-profile filter/blower module incorporates 1200 CFM impeller blowers designed for quiet, continuous duty. A flexible mounting system enables it to function as a positive-pressure blower in one set of applications, drawing air through intake baffles and directing filtered air through an exhaust grid. In the other mounting position, it functions as a negative-pressure ventilator, drawing exhaust fumes through a charcoal purification filter and then releasing them through 8"-diameter exhaust flanges.
The polypropylene housing accommodates a variety of filters. HEPA (High- Efficiency Particulate Air) and ULPA (Ultra-Low Penetration Air) filters provide Class 10 (and cleaner) air flows—refer to performance graph for flow rate and particle counts. Exhaust purification filters remove from the air stream the fumes produced during soldering, screen printing, chemical titrations, and other processing operations (see page 392 for characteristics of exhaust purification filters). Filters can also be used together in the same housing to ensure a clean, purified exhaust flow.
Hoods are designed to fit on a standard table when interfaced with the filter/blower module. Hoods for vertical flow applications are designed for tables 30" deep or deeper. Hoods for horizontal flow applications require a 34"- 44" deep table to accommodate both the hood and filter/blower. Both hood designs are available in three widths. All hoods feature a segmented access shield that allows ample operator access to the working area and also closes completely to minimize contaminants. Stainless steel hood frames support your choice of five different hood materials.
This range of sizes gives you complete flexibility to design a system that meets your requirements.
Double-width hoods provide ample working space for one operator. Larger hoods maintain effective laminar/exhaust flow rates for larger working areas and several operators.
In fact, their economical, modular design lets you configure a bank of controlled-air enclosures as wide as you want. Because each incorporates its own filter/blower module, the system maintains a uniform laminar flow across the entire work area—no matter how large it is—with minimal noise and turbulence. Compare this working environment with the noisy, wind-blown processing areas in systems that rely on a single, centralized filter/blower!
Hoods are available in five materials. Terra’s light-weight, transparent staticdissipative PVC, which features a surface resistivity between 106 and 108 ohms/square, safely eliminates static build-ups and the particles they attract, making surfaces clean inside and out. Nondissipative PVC and polypropylene enclosures are ideal for use with a wide range of caustic fumes. All hoods feature a stainless steel reinforcement frame for optimal strength and stability.
Hoods can also be equipped with a conduit flange to allow remote applications. Simply specify desired location of input/exhaust when ordering.
Laminar Flow Air Speed 
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