VS-12 Explosive and Toxic Gas Ventilation System

Model # VS-12

The VS-12 explosive and toxic gas ventilation system is a 850 CFM forced fan system used in battery charging rooms and other locations where motive power and stationary batteries are present. The VS-12 can also be used where there is a possibility of other flammable or toxic gasses accumulating in a confined spaced. It is designed to be used in conjunction with the Eagle Eye HGD-3000 gas / smoke detector with silent intrusion alarm. The VS-12 combined with the HGD-3000 provides an all in one package ideal for remote and other locations requiring a low-cost, easy to install system.

  • Specifications
  • FAQs
  • Benefits
  • More Info

Technical Specs

Mounting Requirements:Opening: 311 x 311 mm (12.25 x 12.25 in.)
Wall thickness: 38 to 203 mm (1.5 to 8 in.)
Dimensions:L x W x H: 241 x 305 x 305 mm (9.5 x 12 x 12 in.)
Power Requirements:110 AC, .67A (80W)
24 VDC, 3.5A
48 VDC, 1.7A
Airflow:850 CFM
Optional:Reversed fan for use as forced air
Certifications:Class 1 Division 2 Group B Motor


What are some common applications areas for this product?
Common applications include but are not limited to:

  • Utilities and Power Plants
  • UPS Power Systems
  • Fuel Cell Test Stations
  • Nuclear Waste Reforming
  • Hydrogen Refueling Stations
  • Fire Department
  • Battery Suppliers
  • Battery Charging Rooms
  • Motive Power
  • Golf Cart

What are the benefits of installing a VS-12 ventilation system?
In rooms with battery charging systems or other areas where hydrogen gas may be present, it is extremely important to remove the hydrogen gas from the area before it builds up and creates unsafe environments. The VS-12 ventilation system is to be used in conjunction with our HGD-Series hydrogen gas detectors in order to ventilate hydrogen out of an area once it is detected. If a room has hydrogen gas buildup, the HGD-Series gas detector will turn on the ventilation fans when the atmosphere reaches 1% hydrogen concentration. Alarms will also sound at 2% concentration. Both of these would have been well before the lean mixture of hydrogen could ignite. During this period of time, the fans will be operating to vent out the hydrogen gas.

What is the required wall thickness to install the VS-12?
The wall must be a minimum of 1.5 inches to a maximum of 8 inches. The fan includes a sliding collar for easy installation to various wall sizes.

What are the power requirements for the HGVS-1000?
There are a few different input power options available to choose from for the VS-12. Available power options are 110 VAC, 24 VDC, or 48 VDC.

Can the ventilation system be set up in the reverse direction (forcing air inside)?
Yes, the unit usually is set up to exhaust air out of the room, but can be factory configured to force air into a room if necessary.


  • Compliant with NEC 501, Class I Division II Group B
  • 850 CFM wall mounted fan
  • Powered louvers
  • Designed for use with explosive or toxic gas detectors, including the Eagle Eye HGD-Series
  • LED status display
  • Motorized louvers locked when open or closed
  • Simple installation with sliding collar to fit different wall thicknesses
  • Long operating life
  • Available in 120 VAC and 24 or 48 VDC versions
  • Insurance premium reduction may be realized

More Info


The VS-12 gas ventilation system comes as a single piece. Installation requires a 12.25 x 12.25 inch opening in the wall with a minimum wall thickness of 1.5 inches to a maximum of 8.5 inches. The fan includes a sliding collar for easy installation to wall thicknesses. A clearance of four feet is recommended from the wall in front of the unit. The VS-12 is attached by using normal fasteners. Multiple HGD-3000 units can be wired to a single VS-12 fan if needed.

All-In-One Detection and Ventilation:

Hydrogen Gas Detection and Ventilation
If a battery room has hydrogen gas buildup, the HGD-3000 gas detector will turn on the fan when the atmosphere reaches 1% hydrogen. Alarms will sound at 2% concentration, well before the LEL of 4.1%. If 2% LEL is detected, the VS-12 fan automatically vent the hydrogen gas out of the room.

Smoke Detection and Ventilation
The HGD-3000 has a photoelectric smoke sensor built in which detects minute combustion products from smoldering wire insulation, battery cases, and other material. When smoke is detected, a distinctive alarm is emitted from the 80db horn and a separate dry contact switch is activated. At this time, the VS-12 exhaust fan is inhibited in order to deny the fire increased oxygen from outside air.

Temperature, Loss of Power, and Intrusion
During normal operation and in the absence of an alarm condition, an internal thermostat will turn on the VS-12 exhaust fan at a preset temperature to reduce heat buildup in the room. Loss of power to the unit will also generate a dry contact alarm. Additionally, an optional infrared intrusion alarm will trigger a silent dry contact switch.

The VS-12 Kit Includes:

Eagle Eye also offers a larger 24 x 24 inch, 4-fan system with additional capabilities. See the HGVS-1000 Hydrogen Gas Ventilation System for other ventilation needs.

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  • Model #

    12" (311mm) Hydrogen Gas Exhaust Fan

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