The ductless fume hood should be located away from disturbing influences which could cause drafts or affect air movement, such as open doors and windows, and should not be located near areas of heavy pedestrian traffic.
The owner shall ensure that records regarding the dates of installation and filter changes, maintenance and repairs, operator training, and chemical usage are maintained. These records shall be made available to Occupational Safety upon request.
Filters shall be those recommended or supplied by the manufacturer of the ductless fume hood only.
The owner shall ensure an evaluation of the filters after a spill to determine if a change is required. Often the high concentration of the spilled material is enough to saturate the filter, causing the contaminant to be readily discharged from the hood, potentially exposing the lab employee(s).
The person changing the filters shall contact the University Hazardous Waste Unit before disposing of any replaced filters. They may need to be disposed of as hazardous waste in accordance with regulatory requirements.
| Model Specification | WJ-1500A | WJ-1500B | WJ-1800A | WJ-1800B |
| External dimensions of equipment(mm) | 1500(W)*1205 (D) *2400 (H) | 1800(W)*1205 (D) *2400 (H) | ||
| Dimension of works pace (mm) | 1260(W1)*780(D1) *1100 (H1) | 1560(W1)*780(D1) *1100 (H1) | ||
| Panel material | 20+6mm thick butterfly ceramics | |||
| Material of internal lining board | 5mm thick ceramic fiber board | |||
| Diversion structure | Lower air return | |||
| Control system | Button control panel (LCD panel) | |||
| PH value control | The medium is alkaline water solution; manual monitoring, and manual control through acid pump and alkali pump. | |||
| Input power | Three-phase five-wire 380V/50A | |||
| Current for air fan | Not over 2.8A(380V or 220V can be directly connected) | |||
| Maximum load of socket | 12 KW(total of 4 sockets) | |||
| Water tap | 1 set (remote control valve + water nozzle) | No | 1 set (remote control valve + water nozzle) | No |
| Water discharge way | Magnetic chemical pump strong discharge | |||
| Using environment | For non-explosion indoor use, within 0-40 degrees Celsius. | |||
| Applicable fields | Inorganic chemistry experiment; Food, medicine, electronics, environment, metallurgy, mining, etc. | |||
| Ways of Purification | Spray sodium hydroxide solution, no less than 8 cubic meters/hour | Spray sodium hydroxide solution.no less than 12 cubic meters/ hour | ||
| Ways of surface air speed control | Manual control (through the electric air valve to adjust the exhaust air volume or adjust the height of the moving door) | |||
| Average surface air speed | 0.6-0.8 m/s Exhaust air volume: 1420-1890m3/h (when door height h =500mm) | 0.6-0.8 m/s Exhaust air volume: 1760-2340m3/h (when door height h =500mm) | ||
| Speed deviation of surface air | Not higher than 10% | |||
| The average intensity of illumination | Not less than 700 Lux; Standard white and uv-free yellow LED lamps; The illumination is adjustable. | |||
| Noise | Within 55 decibels | |||
| Flow display | White smoke can pass through the exhaust outlet, no overflow. | |||
| Safety inspection | No spikes, edges; Charged body and the exposed metal resistance is greater than 2 mQ; Under 1500V voltage, no breakdown or flashover occurred for 1min test. | |||
| Resistance of exhaust cabinet | Less than 160 pa | |||
| Power consumption | Less than 1.0kw/h (excluding power consumption of fans and external instruments) | Less than 1.2kw/h (excluding power consumption of fans and external instruments) | ||
| Water consumption | Less than 3.2L/ h | Less than 4.0L/ h | ||
| Performance of wind compensation | With a unique wind compensation structure, the volume of the wind will not cause turbulence in exhaust cabinet and will not directly blow to the staff (need to connect to the air compensation system of the laboratory) | |||
| Air volume regulating valve | 315mm diameter flanged type anti-corrosion electric air flow regulating valve (electric contact actuator) | |||
Ductless fume hoods are used in various fields. Some of the most common applications are the following:
Ductless fume hood are not meant to be used with toxic, flammable, or large quantities of hazardous agents/chemicals. Typical applications are for low hazard materials, or nuisance or odor causing dust and vapors.
The person functioning as the owner must identify him/herself as such before a purchase is made or a change in ownership takes place.
The owner or the purchaser must notify Occupational Safety before a ductless fume hood is purchased. An evaluation of its intended application will be made by the Occupational Safety Unit to determine if a ductless fume hood use is appropriate. Occupational Safety will maintain a list of ductless hoods as they become approved.
The chemical range is limited by the type of filter being used inside the fume hood. Depending on your application the filter may need to be swapped out to meet the purification needs. HEPA, ULPA, Activated Charcoal Carbon for General Purpose, and Activated Carbon for Acid Gasses filters are available.
