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  2. Grate heater - Wikipedia

    en.wikipedia.org/wiki/Grate_heater

    However the unique environment of a fireplace and the burning of gas, wood, coal, pellets, etc., require specific heater designs and material construction making few, if any, grate heaters compatible with all fuels. The most critical elements of any tubular grate heater are: 1) Safety - construction material and method, design and features.

  3. Pressure switch - Wikipedia

    en.wikipedia.org/wiki/Pressure_switch

    Industrial pressure switches may have a calibrated scale and pointer to show the set point of the switch. A pressure switch will have a hysteresis, that is, a differential range around its setpoint, known as the switch's deadband, inside which small changes of pressure do not influence the state of the contacts. Some types allow adjustment of ...

  4. Fireplace - Wikipedia

    en.wikipedia.org/wiki/Fireplace

    A fire is contained in a firebox or fire pit; a chimney or other flue allows exhaust gas to escape. A fireplace may have the following: a foundation, a hearth, a firebox, a mantel, a chimney crane (used in kitchen and laundry fireplaces), a grate, a lintel, a lintel bar, an overmantel, a damper, a smoke chamber, a throat, a flue, and a chimney ...

  5. Electrical equipment in hazardous areas - Wikipedia

    en.wikipedia.org/wiki/Electrical_equipment_in...

    This includes both low power levels, and low stored energy. Common with instrumentation. Explosion proof Explosion-proof or flame-proof equipment is sealed and rugged, such that it will not ignite a hazardous atmosphere, despite any sparks or explosion within. [7] [8] Several techniques of flame-proofing exist, and they are often used in ...

  6. Mercury switch - Wikipedia

    en.wikipedia.org/wiki/Mercury_switch

    A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit.

  7. Region by Region, This is What's On American's Christmas Tables

    www.aol.com/region-region-whats-americans...

    South. Ham – especially country ham – is a more common Christmas main dish in the South than elsewhere in the country, along with sides including mac & cheese and cornbread.Lechon, or spit ...

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