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Variation of face velocity in single sided bench mount hoods does not exceed plus or minus 10% of the average target face velocity when tested in the manufacturers test facility with the sash in the full open position.
Single side bench mount fume hoods are performance tested to the ASHRAE 110 - 1995 method of testing performance of laboratory fume hoods and are capable of achieving an as manufactured (AM)rating of better than 0.05 PPM at 4 liters per minute (4 AM 0.05 ) with the vertically rising sash in the full open position. Walk - in fume hoods will be performance tested with the upper vertically rising sash in the full open position and the lower sash sash in the closed position.
All electrical fixtures are factory installed and pre-wired to a junction box on the roof of the fume hood superstructure. L&ST offersa wide range of FUME EXHAUST HOODS to suit every specific application of the user. the hood is fabricated from water proof commercial quality ply &block boards externally covered with industrial laminated sheets and interiors coated with epoxy paint over a suitable primer base . The inner walls of the working chamber is covered with epoxy coated or FRP or HDPE lining or required. The working table is made of acid proof glazed tiles and provided with gas/air pet cocks and additional power points, diffused fluorescent tubes.
The front shutter is of shatter proof clear glass, framed in suitable wooden structure with vertically sliding facility and is connected with counter weight balancing arrangement.
The exhaust system consists of a dynamically balanced centrifugal impeller, made of PVC/FRP,directly coupled with a TEFC industrial motor of 1440 RPM 3 phase 415 v and controlled by a DOL starter with systems ranges from 500 CFM to 1250 or above as it is proportional to the dimensions of the hood.
Our fume exhaust hoods are provided with suitable ducting of FRP or PVC material with required diameter and length as per the site conditions.
Our fume exhaust hood is also available with full FRP construction or combination of FRP and ply, with or without work bench. We also design and manufacture scrubbers,fume Extraction & Dust Collection Systems.
Note :- Our fume hoods are designed to be used for chemical reagents used typically for semiconductor processing , like , HF , H2SO4 , HCI, HNO3 , bromine and organic materials like Trichloroethylene (TCE) ,Acetone , Ethanol , methanol , acetic acid etc.