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Balanced Ventilation Doors – BVD


Balanced Ventilation Doors (BVD) During Manufacturing

Zacon's Balanced Ventilation Door (BVD) is a game-changer in the mining industry, offering unmatched efficiency and safety. This innovative door system effectively addresses static pressures by canceling their effects on the two door panels. By moving in opposite directions, the force applied to one door panel aids the movement of the other, ensuring smooth opening and closing operations.

USA Patent No.: 6.361,430 B2
Canadian Patent No.: 2,348,348

Our Balanced Ventilation Doors are designed to handle even the most demanding conditions. These robust doors can be operated manually, allowing for easy control of massive vent doors.
Additionally, the effects of ramp slopes are effectively nullified as one door panel operates uphill while the other operates downhill. This ensures consistent performance and enhanced safety in underground applications across various industries, including diamond, gold, nickel, copper, palladium, platinum, gypsum, potash, zinc, titanium, uranium, coal, and more.



  • Low force actuation

  • Local and surface operation

  • This is all possible due to Zacon’s Patented Balanced Ventilation Door System

  • Control of Traffic

  • Mine 1-hour fire-rated door fabrication. (with 3/16″ steel plated skin on door panels) custom as required

  • Extra wide opening, the door swings out of traffic way when in open position up to (100 Deg.).

  • Door systems are quick and easy to install.

  • On board PLC communicates and operates with the surface if required.

  • Surface Control for Blasting Operations.

  • The patented balanced system ignores static air pressure and ramp slopes.

  • From 0 to 14” W.C

  • Economical low power draw. All components are designed for absolute minimal/no maintenance and upkeep.

  • Push buttons, pull cords, cap lamp sensors, remote control motion sensors, and manual operation.

  • Custom programming.




  • Heights: from 5 feet to 16 feet

  • Widths: from 7 feet to 16 feet

  • Custom sizes available

Door Frame

  • 8″ Steel Channel 44W (300W)

  • 15mm rebar hoops (welded to mainframe for shotcrete installation)

Door Leafs

  • 2″ x 3″ HSS tubing 50W (350W)

  • 3/16″ steel plate skin 44W (300W) Fire Rated 1 hour


  • Extra Heavy-Duty Hinges

  • Greaseless (maintenance free) grease at install and don’t regrease again

Balance Arms

  • Extra Heavy Duty Balance Plates

  • Drive mechanisms


  • Electro-Hydraulic Actuator

  • 115V.A.C., 20 Amp, single phase c/w Hydraulic

  • Power Pack (develops 3,680 lbs. of thrust).

Control Panel

  • NEMA 4X enclosure

  • All control CSA-approved buttons

Safety Devices

  • Warning horns (regulation)

  • Flashing lights (regulation)

  • Redundant Trip sensors (regulation) pressure and static

  • Safety Zone (optional)


  • Safety Yellow (2-part epoxy system)

  • Primer: Zinc Rich Primer

  • Preparation: Commercial Sand Blast



Zacon's Balanced Ventilation Doors are meticulously designed with safety as the top priority. Our industry-standard doors incorporate numerous safety features to ensure the well-being of personnel in any environment.

From robust construction to prevent accidents, to enhanced visibility features for improved awareness, our doors are engineered to address potential risks and hazards effectively.

  • High visibility Safety Yellow paint – 2-part Epoxy

  • Reflective tape striping

  • Warning alarms flashlights & horns when the door is about to move and while in motion. (necessary to meet the Mining Act) in Canada.

  • Safety trip; release shuts down door movement if personnel, machinery, or objects are in the full path of doorway

  • Manual override – doors can be opened manually, even in a power failure.



Manual Door System

A manual door has many benefits being the key component to the entire Zacon system. What makes this Mine Ventilation Door advanced from the rest, is the Patented Balancing System. This unique design can be manually opened even under high static pressures, eliminating all mechanical controls and built in personnel doors.

Controlled System

Have full control over the Zacon Balanced Ventilation Door with a pre-programmed or custom-programmed controlled panel.

From operating a single door to an Air Lock system. These control panels can be adapted to what you require.

Controlled System Points 

  • Standard open/close.

  • Surface controlled opening/closing.

  • Percentage positioning for control of SCFM (keep door position at #% open). Optional.

  • Motion control.

  • Pull Cord Switch / Cap Lamp Sensor for Door Operation / Hand held/ equipment mounted remote

  • Custom Controls to meet your needs.


  • Retrofit your old Door with Zacon Controls.

  • Install Zacon Balanced Ventilation Door in Existing Door Frames.


All Balanced Ventilation Door Systems, as well as Retro-Fit Systems, come complete with General Arrangement, Installation, and Wiring drawings.

These drawings are printable versions. And are made to you in 11″ x 17″.


Also included with the Door System is a complete manual. This complete manual is specific to the actual designed Door System or Retro-Fit package. The manual includes an installation, operations, and maintenance section; along with a parts list and the PLC Programming. A hard copy and printable version on USB Key.

BVD Manufacturing and Installation Images

Choose Zacon's Balanced Doors to enhance safety and convenience in your operations.

Contact us today to learn more about our industry-leading solutions and how they can benefit your specific needs.

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