smoke density

No corrosive gases will be released in case of fire and the smoke density is low.

Those that exceed the limits for smoke density will be cited, and owners will have 45 days to lower the emissions.

Instrument tests should include gauging smoke density and carbon-dioxide content, and taking the temperature of combustion exhaust inside the stack.

The ASTM standard E84 defines a standard test method for surface flame spread and smoke density measurements.

The tests are usually the same except that measuring carbon monoxide in flue gasses normally replaces gauging smoke density (gas furnaces should produce no smoke).