HEMCO Corporation

  UL 1805  
SE UL Hoods

Auxiliary Air Fume Hoods
The energy saving Auxiliary Air Fume Hood requires zero room air. This is because the auxiliary air supply is equal to the CFM exhaust of the hood - thus zero room air is required. With sash at an 1/2 open operating position and a face velocity of 100 fpm, the supply equals the exhaust; which makes up for insufficient room air availability and by not exhausting expensive existing tempered room air.
Auxiliary Air Fume Hoods
UniFlow Superstructure exclusive unitized dual wall construction for superior chemical resistance, strength, and durability. 1 piece interior fume chamber to be glass-smooth with Varaflow baffle system & bell shaped exhaust collar. Meets NFPA-45 classification with flame spread of less than 25 per ASTM E-84.
Access Panel removable to access ducting connections and electrical services from a single point electrical box, 115/60Hz AC operation.
Full 28” Viewing Height provides ease of access for apparatus set-up in fume chamber. 24" interior reach in depth, and 44" interior working height. Sash is perfectly counter balanced, 3/16 tempered safety glass, coated stainless steel cable with stainless steel pulley assembly. Framed in nonmetallic PVC framing, track, and aerodynamic sash lift for ease of movement and air flow efficiency.
Plumbing Fixtures are color coded to specific service. (Optional equipment)
Fume Hood Fire Extinguisher (Optional equipment)
Epoxy Work Surfaces (Optional equipment)
Fume Hood Base Cabinet (Optional equipment)
Sash Stop located at 1/2 open position to reduce air flow 50%, (Optional equipment) Cat. No. 51651
Air Flow Monitor (Optional equipment) continuously monitors face velocity air flow, meets ANSI and OSHA requirements.
Cat. No. 51403
Auxiliary Air Fume Hoods
UniFlow Auxiliary Aire Hood Cat. No. 21521
shown with optional epoxy resin worksurface, fixtures, and base cabinets
UniFlow Auxiliary Air Fume Hoods• Auxiliary-Air fume hoods are equipped with auxiliary air plenum to induce added air flow to
face opening of hood.

• Supply air ducting and remote blower are required.

• Example: A 60” Hood with the sash 1/2 open, and an exhaust of 474 CFM combined with a 474 CFM supply of ambient air. The amount of make up room air required would be zero
Auxiliary Air Fume Hoods
Air flow (sash open) auxiliary make-up, air enters supply plenum and is distributed down the exterior face in through sash opening. Near zero room air. Air flow (sash closed) auxiliary make-up, air diverts from the supply plenum through the air-by-pass opening into the fume chamber. Near zero room air.

Auxiliary Air Fume Hoods

Auxiliary Air Fume Hoods
48" 60" 72"
1. UniFlow Auxiliary Air CAV ByPass Fume Hood with Vapor-Proof Light:Superstructure to be unitized composite FRP fire resistant non-metallic construction. Integral fume chamber to be seamless glass-smooth with all coved corners with adjustable VaraFlow baffle system and bell shaped exhaust collar. Picture frame sash opening with counterbalanced clear tempered safety glass sash with chemical resistant PVC framing, track, and aerodynamic sash lift. Built-in auxiliary air supply plenum to reduce volume of conditioned air from room. Vapor-proof LED light fixture and control switch pre-wired to single point junction box,115/60Hz AC, All electrical components U.L. listed. Requires a remote exhaust blower, based on 50% supply air makeup. 30" 21421 21521 21621
2. UniFlow Auxiliary Air ByPass Fume Hood with Explosion-Proof Light:Same as #1 above except equipped with explosion-proof vapor-proof light fixture Class I, Div II Groups A B C & D, Class II Div II Groups F & G electrical fixture installed but not wired, must be wired to comply with local codes. 115/230V, 50/60Hz AC. For other explosion-proof electrical options, auxiliary supply blower see below. All electrical components UL listed. 30" 21423 21523 21623
3. Supply blower,coated steel with:V-belt drive and adjustable pulleys permit field balancing. Weather housing and drain is furnished. Motor has thermal overload protection Specify 115V 1 ph, 230V 1 ph, 230/460V 3 ph. Blowers based on 50% supply makeup. For 48” 1/4 HP 385 cfm @ 1/2”
S. P. Loss
For 60” 1/4 HP 474 cfm @ 1/2”
S. P. Loss
For 72” 1/4 HP 542 cfm @ 1/2”
S. P. Loss

Auxiliary Air Fume Hoods

Auxiliary Air Fume Hoods
Family Drawing
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