•Manufactured by:Bel-Art
•模型：Techni-Dome
•Width:22"
•Depth:22"
•Height:22"
•最大开放：18"H
•制造商Sku：50000-0100
•测量单位：EA
实验室引擎盖在实验室环境中有许多关键目的。
Such hoods, often called laminar flow workstations or clean benches, use a flow of HEPA-filtered air to prevent influx of viable and non-viable particles into the enclosure and to sweep away any contaminants generated by the work process.
对于烟雾遏制，实验室烟雾罩使用维持负压的管道通风系统。如果管道是不切实际的，则可以使用HEPA或活性碳过滤器去除无管引擎盖（烟雾或颗粒）。
Biological safety cabinets combine aspects of both hood types: a laminar flow of micro-filtered air and negative-pressure containment of bio-hazard fumes.
Laminar flow hoods (also called laminar flow clean benches) force air through a HEPA or ULPA filter to create a clean work area free of nearly all contaminating particulates, including bacteria, mold spores and many viruses. These hoods use a vertical or horizontal airflow design. Both provide excellent protection of products from particulates and cross-contamination, but do not protect the operator or environment.
So why choose one over the other? Vertical laminar flow hoods (VLF Hoods) require less floor space, but more overhead clearance. In addition, a sash at the front of the VLF hood provides a barrier between air exiting the hood and the operator’s face. VLF hoods create turbulent air flow when air strikes the work surface, requiring sterile work to be performed above the work surface.
HLF hoods minimize air turbulence (and particle backflow) on the work surface except where equipment disrupts the horizontal airflow. However, they direct the airflow directly at the operator’s face and require more depth to accommodate placement of the fan filter unit at the rear of the hood.
实验室通风罩通过引擎盖的开口从环境中吸引空气，从而使环境污染物进入工作区域。因此，实验室通风罩不提供无菌环境或产品保护。取而代之的是，化学烟雾罩旨在保护操作员免受危险或刺激性的烟雾和因引擎盖内部工作而产生的粉末和粉末。
在管道的烟雾罩和冠层通风罩中，空气从引擎盖上透过导管，通向内部通风系统，其中包含和/或中和危险材料。
In ductless fume hoods, fans draw exhaust air through a series of filters that remove irritating substances before release back into the room. Since these filters are not 100% efficient in removing all substances, ductless fume hoods are not advised in the presence of biohazards; however, they provide a convenient, cost-effective solution for operations involving irritating but non-hazardous fumes in facilities where an in-house HVAC system cannot be accessed.
Biological Safety cabinets combine design aspects of both laminar flow and fume hoods. Filtered air is directed downward onto the work surface and then travels into a plenum through openings on the front and sides of the hood. Depending on the classification of the biosafety hood, some percentage of air is recirculated through a HEPA filter while the rest is directed out of the hood through an exhaust system. Thus, biosafety cabinets offer operator, environmental and product protection.
These laboratory safety cabinets (sometimes called IV hoods or compounding hoods) are ideal when preparing sterile medications such as chemotherapeutic agents that may pose a risk to the operator.
在使用危险或潜在的传染性材料时，保护人员必须是主要问题。但是，提供人员保护不必以冒着产品完整性冒险的成本。II类BSC同时为人员和产品提供保护。他们维护一个ISO 5级清洁工作区域进行产品操作，同时确保将排气空气过滤并从环境中进行管道。因此，当使用中等危险的材料以及人员和产品安全性时，II类BSC是理想的解决方案。
•Manufactured by:Bel-Art
•模型：Techni-Dome
•Width:22"
•Depth:22"
•Height:22"
•最大开放：18"H
•制造商Sku：50000-0100
•测量单位：EA
•电气规格：12 V
•Weight, Product:11 lb
•Dimensions, Product:22“ w x 22” d x 22“ h
•Weight, Shipping:15 lb
•Dimensions, Shipping:22" W x 22" D x 15" H
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层层来自拉丁层，这是一块薄材料。当用来描述实验室引擎盖时，“层流”一词是指空气以平行层以相同速度和相同的方向移动的过滤器，垂直或水平地穿过整个机柜。可以预见，在工作过程中，在空气流中引入的任何颗粒都朝着流动的方向横扫，并从临界过程的下游围栏中移除。
Disruption to laminarity results in turbulence, a randomized flow that suspends particles in eddies rather than removing them. Because they can remain in the system, carried by “second-pass” air that swirls around the critical work area, contaminants are deposited unpredictably, often with disastrous results.
Vertical laminar flow (VLF) hoods position the fan filter unit on top of the hood, a space-efficient design that accommodates most facilities as long as overhead clearance isn’t a problem. Horizontal laminar flow (HLF) hoods position the fan on the back of the hood, necessitating as much as 18” or more additional floor or bench space for fan, filter and make-up air flow. In a cleanroom or lab where space is at a premium, that difference alone could determine your choice.Footprint Advantage: VLF Hood
VLF hoods often have an adjustable sash at the front of the hood to maintain the downward laminar air flow. HLF hoods are generally open at the front of the hood to ensure unrestricted horizontal air flow. The larger opening of an HLF hood makes placement of large objects and instruments easier when compared to a VLF hood although, without a sash to serve as a shield, chemical fumes or powders inside the work area may blow into the operator's face.Sash Advantage: VLF Hood (operator safety); HLF Hood (transferring large materials)
Although both hoods are effective at sweeping particles from the hood, air eventually encounters obstacles that disrupt laminar flow. In most VLF hoods, the work surface creates turbulence, so critical processes must be performed above the surface to avoid contact with “second-pass” air that could contaminate a sensitive operation. Some VLF designs include a perforated floor with sub-surface plenum to reduce this obstruction, but these measures add cost. HLF hoods generally minimize this airflow disruption. However, large objects placed on the work surface can cause swirling or contaminate downstream materials, so critical operations should take place adjacent to the filter face.层流优势：HLF引擎盖
We end with a tie; your working conditions will help you determine which of these advantages matter most in your operation.
Safety Alert: Under no circumstances should laminar flow hoods be used in the presence of hazardous materials. Use a fume hood or biological safety cabinet for safe biohazard containment.
| 模型 | Horizontal Laminar Flow (HLF) Station | Vertical Laminar Flow (VLF) Station | ValuLine™ VLF Station | 阀门耳语引擎盖 | Portable CleanBooth |
|---|---|---|---|---|---|
| Flow | Horizontal | Vertical | Vertical | Vertical | Vertical |
| 名义宽度 | 7'，6'，4' (2.1 m, 1.8 m, 1.2 m) |
8', 6', 5', 4' （2.4 m，1.8 m，1.5 m，1.2 m） |
8', 6', 5', 4' （2.4 m，1.8 m，1.5 m，1.2 m） |
6'，5'，4'，3'，2' (1.8 m, 1.5 m, 1.2 m, .9 m, .6 m) |
6'，4' （1.8 m，1.2 m） |
| 标称整体深度和高度 | 44"D x 63"H (1118 mm x 1600 mm) |
41"D x 90"H （1041毫米x 2286毫米） |
41"D x 90"H （1041毫米x 2286毫米） |
24”/30”D x 41”H （610/762毫米x 2286毫米） |
30"D x 82"H (762 mm x 2083 mm) |
| Nominal Working Space | 30"D x 28"H （762毫米x 711毫米） |
27英寸D（686毫米）；高度取决于使用的工作台 | 27英寸D（686毫米）；高度取决于使用的工作台 | 24英寸/30英寸D X 23英寸H（610/762毫米x 584毫米） | 24"D (610 mm); height depends on workbench used |
| Construction Material / Options | Powder Coated Steel Frame | ||||
| 工作表面选项 | Workbench sold separately; many top materials available. 2-piece frame isolates fan vibration. | 304不锈钢工作表面 | 放在user-furnished bench (stands available) | Workbench sold separately; many top materials available. 2-piece frame isolates fan vibration. | |
| 鼓风机类型 | Integrated Fan/Filter Unit | Integrated Fan/Filter Unit | Integrated Fan/Filter Unit | Integrated Fan/Filter Unit | Integrated Fan/Filter Unit |
| 空气流动， | 7'（2.1 m） 6' (1.8 m) 4'（1.2 m） |
8' (2.4 m) 6' (1.8 m) 5' (1.5 m) 4'（1.2 m） |
8' (2.4 m) 6' (1.8 m) 5' (1.5 m) 4'（1.2 m） |
6'（1.8 m） 5'（1.5 m） 4'（1.2 m） 3 ' (.9 m) |
6' (1.8 m) 4'（1.2 m） |
| CFM (m³/hr) | 1130 (1920) 960（1632） 650 (1104) |
1300 (2209) 960（1632） 840（1427） 650 (1104) |
1300 (2209) 960（1631） 840（1427） 650 (1104) |
960（1632） 840（1427） 650 (1104) 558 (948) |
960（1632） 650 (1104) |
| Filter Types | HEPA or ULPA | HEPA or ULPA | HEPA or ULPA | HEPA or ULPA | HEPA or ULPA |
| Prefilter | 可洗的聚氨酯泡沫 | Washable polyurethane Foam | Washable polyurethane Foam | Washable polyurethane Foam | Washable polyurethane Foam |
| 可移植性 /安装访问 | Not portable | Not portable. 比标准门框宽 |
Not portable. 比标准门框宽 |
Portable | Portable: CleanBooth frame uses casters. |
| 前窗格配置选项 | 在工作区域的三个侧面的接收空气插槽 | 向上倾斜 | Uses softwall panel kits: vinyl, anti-static vinyl, or non-outgassing polyurethane |
||
| Lighting | LED | LED | LED | LED | Optional fluorescent lighting |
| Noise Level, Measured 30" (762mm) from filter face at 90 FPM (.46m/s) | <50 dBA | <50 dBA | <50 dBA | <50 dBA | <50 dBA |
| Airflow Monitor Options | Minihelic gauge monitors backpressure across filter | Includes touch screen controls with backpressure indicator | Optional: air velocity meter and differential pressure gauge for filter backpressure | Optional swing-vane anemometer | Optional: air velocity meter and differential pressure gauge for filter backpressure |
| 电源要求 | 120 VAC，50/60 Hz 或220VAC，50 Hz |
110 VAC，50/60 Hz 或220VAC，50 Hz |
110 VAC，50/60 Hz 或220VAC，50 Hz |
110 VAC，50/60 Hz 或220VAC，50 Hz |
120 VAC，50/60 Hz 或220VAC，50 Hz |
| Price Range | $9,300 – $14,300+ | $ 6,000- $ 14,000+ | $5,000 - $10,000+ | $ 1500 | $2,000 - $4,500+ |
| Application Synopsis |
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