4WG means 4-pass Wet-back fire tube Boiler with Gun Burner in Commercial
Similar to 4WG
4LVB - Four-Light Vanity Bar4SR - Four-channel Surround Sound
4SR - Four-shelf door mount Spice Rack
4SR-15 - Four-Shelf door mount Spice Rack, 15 inches long
4SR-18 - Four-shelf door mount Spice Rack, 18 inches long
4SR-21 - Four-shelf door mount Spice Rack, 21 inches long
4W-B - Four Wire, Base mounted smoke detector
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