Clamshell heat exchanger for a furnace or unit heater

Cold spot baffle for coupling box

Combustion heater

Combustion heater

Combustion system for a heater

Combustion type heater

Compact forced air heater

Compact gas-fired air heater

Compact high efficiency furnace

Compact high-efficiency air heater

Compact, high efficiency heat exchanger for a fuel-fired forced

Condensate drainage system for an outdoor condensing furnace

Condensate handlers for multi-poise furnace

Condensate isolator and drainage system for furnace

Condensate overflow control for furnace

Condensate trap for multi-poise furnace

Condensing furnace with corrosion suppression

Curved inshot burner and method for vent-within-casing furnace

Direct gas-fired burner assembly

Direct gas-fired heating and ventilation method and apparatus