Specifications - The Tommyknocker

• Physical Dimensions
  • Length (standard) 14 ft (4267 mm)
  • Width 88 in (2235 mm) 
  • Height 87 in (2210 mm) 
  • Weight 4386 lb (1989 kg)
• Room Dimensions
  • Main Room (refuge area): Length (standard) 10 ft (3048 mm); contains padded benches for comfortable seating and extra storage
  • Air Lock Room: Length 4 ft (1219 mm); contains a toilet, drinkable water dispenser and first aid kit
• Capacity
  • Standard 14 ft (4267 mm) chamber accommodates 10 people
  • Additional 2 ft (610 mm) sections can be added to accommodate extra people 
• Electrical
  • Charger inputs: 120V AC, 60 Hz
  • Outputs: 12V DC
  • Other voltages/frequencies available
• Composition
  • Heavy-duty, 12-gauge formed steel; sandblasted inside and out; epoxy primed and urethane painted
  • Solid steel wall-divider between room 
• Doors/Windows
  • 2 sealed doors with secure freezer style handles provide an air lock
  • Each door contains a window
• Toilet: Self-contained 24-litre capacity
• Drinkable Water Dispenser: 26-litre (7 gallon US) capacity

Options available upon request:

• Compressed Air Outlet Station
  • Connects to the mine's compressed air system
  • Compressed air is filtered and pressure reduced (includes regulator & drain)
  • Includes a muffler for noise reduction
• Carbon Monoxide Scrubber
  • Size & model based on expected volume and concentration of carbon monoxide
• Portable Gas Monitor (with digital gauges)
  • Measures oxygen, carbon dioxide, carbon monoxide and other optional gases
• Air Conditioner
  • Controls interior heat and humidity
  • DC powered, wall mounted 
  • Batteries and a charger are mounted inside a cabinet located under the bench seats
  • Back-up battery power: Up to 36 hours when batteries are fully charged (100% duty); up to 48 hours when the duty cycle is 60% (average)
  • Using DC power, instead of AC, means the unit does not require a large inverter, which extends battery life

Testing

• Each unit undergoes a standing pressure test to ensure the unit is leak proof.
• Each unit must hold a pressure of 3 inches of water for a minimum of 60 seconds.