First of all, we need to know what are the ventilation methods of the laboratory? At present, laboratory ventilation methods are generally divided into local ventilation and whole room ventilation.

(1) Local ventilation:

Local ventilation is the discharge of harmful substances nearby, which can discharge a large amount of harmful substances with less air volume, saves energy and has good effect, and can improve the existing laboratory conditions, which is economical and feasible. . .

include:

Fume Hood Ventilation

Desktop Fume Hood Ventilation

Biological Safety Cabinet Ventilation

Atomic absorption hood ventilation

Universal exhaust hood ventilation

Stainless steel exhaust hood ventilation

Exhaust Reagent Cabinet Ventilation

Exhaust medicine cabinets and other laboratory exhaust equipment ventilation

(2) Whole room ventilation

Ventilate the whole room, dilute the concentration of harmful gases in the room to the allowable range of sanitation standards with fresh air sent into the room, and at the same time, discharge the indoor polluted air into the outdoor atmosphere directly or after purification. .

include:

natural ventilation

mechanical ventilation

※ It is often used in rooms that do not have fume hoods and need to discharge harmful substances.

What are the components of a laboratory ventilation system?

The laboratory ventilation system generally consists of ventilation equipment, ventilation ducts, mufflers, fans, and control systems. . .

1. Ventilation equipment:

The commonly used ventilation equipment in the laboratory mainly includes:

Detox cabinets, atomic absorption hoods, universal exhaust hoods, desktop fume hoods, etc. . .

(1) The detox cabinet is a ventilation device that safely handles harmful, harmful gases or vapors. Its function is to capture, seal and transfer pollutants and harmful gases, and place them to escape into the laboratory, so that by inhaling pollutants in the work area, is to minimize the operator’s inhalation exposure to contaminants. The airflow in the detox cabinet is to suck the air in the laboratory into the detox cabinet through the exhaust fan, and after the polluted gas in the detox cabinet is diluted and discharged to the outdoors through the ventilation system, it can achieve low concentration diffusion.

(2) Universal exhaust hood is the first choice for local ventilation, with simple installation and flexible positioning. It has good ventilation performance and can effectively protect the personal safety of laboratory staff. It is suitable for liquid chromatography, gas chromatography or experiments with small exhaust gas and no high temperature.

(3) The atomic absorption cover is mainly suitable for large-scale precision instruments such as atomic absorption instruments that involve high temperature and require local ventilation. Positioning and installation are required, which is also one of the factors that must be considered in the overall laboratory planning.

(4) The desktop ventilation hood is mainly suitable for organic chemistry or laboratories that require long-term distillation. It is one of the indispensable equipment in solving the overall ventilation requirements of such laboratories.

2. Ventilation duct:

For ordinary buildings, if the gas discharged from the room is not corrosive, the ventilation ducts can be made of galvanized steel plates. For laboratories that generate corrosive gases, the ducts should be PVC ducts or FRP ducts made of corrosion-resistant materials. In general laboratory ventilation projects, PVC air ducts are mostly used indoors, and FRP air ducts are used outdoors. For laboratories with insufficient indoor floor heights or laboratories using large air ducts, rectangular air ducts are generally used to match the site space. On the premise of meeting the requirements of air ducts, the space occupied by air ducts should be minimized. Circular air ducts are connected by plug-ins, rectangular air ducts are connected by flanges, and plug-ins can also be connected according to the actual situation.

3. Fan:

Fans mainly include axial flow fans, diagonal flow fans and centrifugal fans. Axial flow fans and diagonal flow fans are suitable for ventilation systems with small wind pressure and short pipelines, such as ventilation systems that are directly discharged to the outside of windows or walls, referred to as: direct discharge; FRP centrifugal fans are suitable for ventilation systems with long pipelines. For example, it is discharged to the roof through air duct wells or external wall pipes, abbreviated as roof discharge. Fan material: generally divided into glass fiber reinforced plastic, PP, PVC and so on. The estimated model is selected according to the air volume and air pressure.

4. Ventilation control system:

The ventilation control system can adopt different control methods according to different situations, such as a single ventilation equipment constant air volume ventilation control system, multiple ventilation equipment frequency conversion control system, multiple ventilation equipment frequency conversion + variable air volume ventilation control system.

Six elements that should be considered in the planning and design of laboratory ventilation system

1. Safety

Safety elements can ensure the safety of operators in the laboratory and the safety of the surrounding environment of the laboratory. Countries have more detailed standards for laboratory safety, and safety is also one of the most important purposes of laboratories.

In order to ensure the safety of operators in the laboratory, we need to accurately control the airflow of various laboratory equipment, such as commonly used fume hoods, biological safety cabinets, universal exhaust hoods, and animal cages in laboratory animal equipment. The purpose of control is to ensure that the toxic and harmful gases generated during the inspection will not escape and endanger the safety of personnel. The guarantee of the safety of the surrounding environment of the laboratory is usually done by ensuring the negative pressure of the laboratory.

2. Pressure control

The usual biochemical laboratories are required to ensure the negative pressure of the laboratory to prevent the toxic gas generated in the laboratory from flowing into the adjacent office area, resulting in interspersed pollution.

3. Energy saving

Today, when the energy problem is more and more panic, energy saving has become a content that laboratory managers are very concerned about. Usually commercial buildings, in order to save energy, use only 15% of the fresh air, and the building operates 10 hours a day, 5 days a week. As for the laboratory, 100% fresh air is often used, operating 24 hours a day, 7 days a week, so the energy consumption is huge, and it is necessary to reduce energy consumption as much as possible on the premise of ensuring safety.

4. Warm

Ensure that the laboratory has a suitable and stable temperature and humidity, and the airflow is stable and odor-free, providing a warm working environment for the laboratory staff to improve work efficiency.

5. Easy to maintain

Overly complex systems often require regular maintenance, complex maintenance procedures and high costs. Therefore, a good control system should be as simple and reliable as possible, with simple maintenance or no regular maintenance.

6. Renovation or expansion of bento in the future　

The design of the control system should try to consider the future transformation and expansion. It makes the update, displacement and addition of equipment such as fume hoods, and the change of laboratory pressure polarity as simple as possible.

Attachment: some laboratory ventilation system design cases

Case number one:

Case 2:

Case three:

Case 4:

Case 5:

 

Exhaust – Extraction Hood lab supplies laboratory equipment dealers

1.Product Name

Fume Exhaust / Fume Hood / Extraction Hood

 

1.Best quality: solid brass body coated with best epoxy powder,resistant to most chemicals

2.Lowest price: supplied from factory(since 1998) directly without any middle charges

                 2.Wide application: for school,medical,laboratory,hospital,industry,science, education, pharmaceutical etc.

3.Efficient delivery: with bulk stock and can arrange delivery as per needs.

 

2.Spec

Product Name	Fume Exhaust / Fume Hood / Extraction Hood
Model	KP8 / KP8-2 / KP8-3
Brand	runwangda
Origin	Zhejiang, China(Mainland)
Color	Red, White
Joint	High Grade PP, to be 360° swiveled, easy to dismantle, assemble & clean
Sealing Ring	Low-friction treated rubber
Center Bolt	304 Stainless Steel
Adjustable Joint Knob	Totally Brass with a S/S bearing inside locked with center bolt
Damper	To adjust air flow with a knob manually
Dome/cup hood	High grade PP / PC
Tube	75mm / PP
Swing Device	With 360 ° swing device, take fixed rack as centre, max enabing movement radius to 1600mm
Installation Bracket	Injection of plastics from a complete Mold, mounting panel strongly connected to the joint