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Home Why It’s Needed What to look for What can be done Methods Who you gonna call? MAKEUP AIR METHODS  The following methods may be used to introduce makeup air into a building in a controlled manner:  A) Outside Air Intake Louver - A motorized intake louver interlocked with the exhaust system is an effective and inexpensive method of introducing outside air into a facility. However, the system may result in localized cold and drafty conditions. Building will continue to operate in a slight negative condition.  B) Supply Air Fan - A wall or roof mounted supply air fan is a relatively inexpensive method of introducing a controlled amount of outside air into a facility. Supply fan should be interlocked with exhaust systems and designed for total air balance (Supply=Exhaust). Supply air fans also can result in localized cold and drafty conditions within the conditioned space.  C) Fan Tube / Mixing Type Makeup Air System - Fresh, unconditioned makeup air can be introduced into a building through perforated duct system which promotes uniform mixing of outside air with indoor air. Modulating mixing dampers provide additional flexibility in matching exhaust and temperature requirements.  D) Thermo-Mixer® Ventilation System- A Thermo-Mixer ventilation system allows fresh, unconditioned makeup air to be introduced into a warehouse building. The design of the Thermo-Mixer system promotes effective ventilation by uniform mixing of outside air with indoor air. Modulating mixing dampers provide additional flexibility in matching exhaust and temperature requirements.  E) Packaged Heat Recovery Systems - Several types of packaged heat recovery equipment are available which permit incoming outside air to be preheated by outgoing exhaust air. System permits energy efficient heat recovery and tempers incoming outside air.  F) Separate Direct Fired Makeup Heater - Provides constant quantity of outside air heated to indoor temperature condition requirements. Direct fired equipment releases all products of combustion (flue gases) into the conditioned space which has the potential to cause condensation problems in tightly constructed buildings in colder climates. For direct fired equipment, building codes may require a specific amount of exhaust and/or a minimum % of outside air to be brought in which may result in significant energy costs.  In a pre-engineered metal building, condensation can cause additional problems with the building insulation.

Makeup Air Heating Systems Information

Makeup Air Heating -  Industrial Warehouse Space Heating Systems
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