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2. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   After the control of air flow and temperature was standardized, the use of electromechanical relays in ladder logic to switch dampers became standardized. Eventually, the relays became electronic switches, as transistors eventually could handle greater current loads. By 1985, pneumatic controls could no longer compete with this new technology ...

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

4. 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 ...

5. Still need to buy a Christmas tree? Here's the good news. - AOL

   www.aol.com/news/still-buy-christmas-tree-heres...

   Growers weren't expecting to raise wholesale prices, according to an annual survey by the Real Christmas Tree Board, based in Howell, Michigan, and sponsored by annual fees paid by growers and ...

6. Free Online Games: Play board games, card games, casino games ...

   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

7. Trump's only Manhattan electoral win is this block on the ...

   www.aol.com/news/trumps-only-manhattan-electoral...

   Built in the 1930s as an affordable housing development, rent prices in the complex are still protected from significant increases by city laws in exchange for tax exemptions for the owners of the ...

8. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Thermal shut off valve or Thermally released shut off valve, protects against excessive temperature, mandatory in the gas installation of some countries; Trap primer: sometimes include other types of valves, or are valves themselves; Vacuum breaker valve: prevents the back-siphonage of contaminated water into pressurized drinkable water supplies

9. How to shop safely on Cyber Monday, throughout holiday season

   www.aol.com/shop-safely-cyber-monday-throughout...

   Black Friday weekend and Cyber Monday offer great sales. But scammers are looking to steal your money with fake deals. Learn how to protect yourself.