Fan coil Low-Static Horizontal Rear Return-Air Plenum (LH-R) Williams

The Horizontal Rear Return-Air Plenum, low-static (up to .25 ESP), fan coil (LH-R) comes with a coil, blower/motor assembly with quick-connect plug and a galvanized steel, powder-coated epoxy drain pan covered with ⅛-inch thick insulation. The galvanized steel plenum is insulated with ½-inch thick, over three pound density, neoprene-coated fiberglass. The plenum conceals the fan and motor assembly that is easily accessed for service by removing the bottom panel. This unit is easily mounted above ceilings, in closets, and in hallways.

Profile: Manufacturer, Designer
Headquarters: US
Establishment date: 1916
Business area: US
Assortment: Heating, Fan coils, Air handlers, Air curtains, Dehumidifiers
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Product descritipion

Fan coil Williams Low-Static Horizontal Rear Return-Air Plenum (LH-R)


Williams LH (Low Static) Series horizontal fan coils have been rated in accordance with AHRI Standard 440-2005 for room fan-coil air-conditioners and are certified by AHRI to meet the following product performance ratings:
LH-R Rear Return-Air Plenum Horizontal

Notes: 1) Based on 80°F DB and 67°F WB EAT, 45°F EWT, 10°F temperature rise, high fan speed. Motor voltage 115/1/60 power source. Air flow under dry coil conditions. Water pressure drops shown in feet of water.


Notes: 1) Based on 70°F DB EAT, 180°F EWT, 40°F temperature drop, high fan speed. Motor voltage 115/1/60 power source. Air flow under dry coil conditions. Water pressure drops shown in feet of water.


  • 200 to 1,200 CFM
  • Low-profile design is effective above drop ceilings, in closets and fits into places with tight vertical dimensions
  • Low static, direct-drive designed for jobs where low-static pressure is required
  • Blow-through design
  • Heavy-gauge galvanized steel cabinet insulated with 1/2" thick, over three-pound density, neoprene-coated fiberglass
  • Includes galvanized, rear return-air plenum insulated with 1/2" neoprene-coated fiberglass
  • One-inch fiberglass, throwaway filter
  • Coils are manufactured of copper tube with aluminum fins and are 100% underwater pressure tested to 350 PSI with a 300 PSI working pressure
  • Three-speed, 115/1/60 motor with quick-connect plug
  • Galvanized drain pan is finished with a powder-coated epoxy, 1/8" thick insulation and features primary and secondary drain connections
  • Controls and motors are factory-wired and terminated in a junction box for single-point power supply
  • One-inch duct collar on return- and supply-air openings
  • Protective covers keep the grille openings free of debris during shipment and construction
  • Individually tagged, crated and shipped as scheduled for installation
  • ETL and AHRI certified; 100% factory tested



    • DX
    • Chilled-Water
    • Hot-Water
    • Electric Resistance
    • Steam

In any combination of the above


  • Thickness up to 1"
  • Fiberglass
  • Foil-face
  • Elastomeric


  • Copper fins/tubes
  • Phenolic-coated
  • Stainless-steel end plates
  • Right, left or opposite-end connections
  • TXV - factory-mounted
  • Freeze protection
  • Custom fin spacing

Drain pans

  • Stainless-steel
  • Extended
  • Drip tray
  • Condensate float switch
  • Condensate pumps


  • Two-inch thick throwaway
  • Washable
  • Pleated


  • Marine duty


  • Motors
    • 115, 208, or 277
    • Single or three phase
    • 50 or 60Hz
    • ECM
    • Line or low voltage
  • 1 to 5 kW electric resistance heat
  • Disconnects
    • Fused
    • Non-fused
  • Condensate float switch
  • Condensate pumps
  • Thermostats
  • UV Light
  • Controls
  • Flow control

Accessories Options 

  • Thermostats
  • Ultraviolet lights
  • Condensate float switch
  • Condensate pumps
  • TXV - factory-mounted
  • Controls - wide selection of factory-mounted valves and controls
  • Flow-control pump for water heating applications

 Fan coil Low-Static Horizontal Rear Return-Air Plenum (LH-R) Williams - 1

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