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iso ul New UL UniFlow Fume Hoods

Auxiliary Air Fume Hoods

Zero room air requirements. The Fume hood exhaust is equal to the auxiliary supply air, thereby zero room air is required. With the sash in the ½ open position & face velocity of 100 feet per minute, the cfm required equals the air supply. The hood exhaust air plus auxiliary air make up for room supply deficiencies. Since expensive tempered room air is not required, Auxiliary Air Fume Hoods provide energy savings.

UniFlow Superstructure exclusive unitized dual wall construction for superior chemical resistance (NO RUST), 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, 115V/60Hz AC operation.
Full 28” Viewing Height with 28” sash opening height for ease of access and viewing tall apparatus setup. Sash is 3/16 thick tempered safety glass, vertical moving with single point counterbalance, contoured sash handle for efficient air flow and ease of movement.
Plumbing Fixtures are color coded to specific service.
Fume Hood Fire Extinguisher optional feature
Epoxy Work Surfaces optional feature
Fume Hood Base Cabinet optional feature
Sash Stop located at 1/2 open position to reduce air flow 50%, Optional equipment Cat. No. 51651
Air Flow Monitor Digital continuously monitors face velocity air flow. Meets ANSI and OSHA requirements. Optional equipment, Cat. No. 51403
UniFlow Auxiliary Aire Hood Cat. No. 21521
shown with optional epoxy resin worksurface, fixtures, and base cabinets

UniFlow Auxiliary Air Fume Hoods

Auxiliary Air Flow Diagram

• 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

• 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

Auxiliary Air Fume Hood
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.

Fume Hood Face Velocity

The recommended face velocity for efficiency
& safety is 80-100 fpm. Lower face velocity may compromise user safety.

Sash in full open position should be for setup of
apparatus & maintenance service only. Design opening
is at 1/2 open at 100 fpm (feet per minute), face
velocity at full open would be approximately 50 fpm.

Auxiliary Air Fume Hood
Sash Management & Design
Size hood 48” 60” 72” 96”
1/2 open cfm 385 474 592 800
Full open cfm 773 938 1162 1613
Click for Auxiliary Air Electronic Plan-A-Hood

Auxiliary Air Fume Hoods

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 feature to reduce volume of conditioned air from room. Vapor-proof LED light fixture and control switch pre-wired to single point junction box,115V/60Hz AC, All electrical components U.L. listed. Requires a remote exhaust blower, based on 50% supply air makeup.





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. 115V/60Hz AC. For other explosion-proof electrical options, auxiliary supply blower see below. All electrical components UL listed. 30"





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   51901      
For 60” 1/4 HP 474 cfm @ 1/2” S. P. Loss     51902    
For 72” 1/4 HP 542 cfm @ 1/2” S. P. Loss       51903  
For 96” 1/4 HP 800 cfm @ 1/2” S. P. Loss         51904

Auxiliary Air Fume Hoods

auxilary fume hoods
Click for Auxiliary Air Electronic Plan-A-Hood Note: Interactive Plan-A-Hood is not compatible with certain browsers or some email systems, If you have questions please use the printed Plan-A-Hood link or contact your sales representative.
Click for Sales, Service, & Request for Quote Click for Fume Hood Base Cabinets
Click for Auxiliary Air Architectural Spec. Sheet Click to Contact HEMCO Corporation BTT
  HEMCO Corporation 711 S. Powell Road Independence, MO 64056 816-796-2900 800-779-4362
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