Heating cold outside air with steam or a hot fluid is a risky business at the best of times; there is always a potential for a freezeup! But with steam of hot water, there is nothing better than Engineered Air’s Lamiflo Integral Face and Bypass Heating Coils. In the more Northern climates, with a significant number of hours per year under 32°F (0°C) outdoor air temperature, Engineered Air does recommend the use of glycol solution instead of hot water, particularly in areas where power failures are prevalent.

Full flow is sent through the coil at all times, preventing freezeup. Temperature control is maintained by a series of Face and Bypass Dampers, spaced evenly over the face of the Lamiflo. Face dampers are employed on both the entering and eliminate unwated heat pickup.

With Lamiflo Face and Bypass Dampers, the steam or fluid flow is constant during the period that the outdoor air temperature is below freezing. Temperature control is achieved by metering the incoming cold air through multiple narrow heating and bypass channels to mix at the control temperature. The bypass channels have been sized to provide a pressure drop when fully open that is equal to the pressure drop through the coil, or heating channel when fully open, to assure a constant volume of air. The air streams emerging from the narrow channels are laminated and mixing is virtually complete within 36” (0.9m) of the Lamiflo section.