Hello from Raymond Korea. Typical underground assets—electrical rooms, boiler rooms, WWTP, extinguisher vaults—lack natural ventilation and are classified confined spaces.

Electrical rooms risk CO/LEL from faults; boiler rooms add incomplete combustion hazards; sewers need O₂/H₂S/LEL; agent rooms need O₂/CO₂.

Safety first: we use lifelines for elevated work and two-person ladder rules.

This customer asked for density-aware mounting. We explain that while codes discuss gas weight, the highest priority is proximity to credible leaks—even if CO₂ is “heavy,” sensing near the cylinder valve often beats a generic floor rule.

We therefore placed CO near breathing zone with oxygen, elevated LEL for methane buoyancy, and low H₂S where dense gases pool.

Entrance LEDs duplicate interior readings so entrants never rely on a single display—critical where agents can cause immediate incapacitation.

Customers often overestimate cost and difficulty—exposed conduit installs are straightforward, and industrial-grade detectors are relatively affordable. Thank you for reading.