Make-up air units are used to introduce outside air into a building to eliminate negative pressure and provide a positive operating pressure within a facility. Fans and blowers used in spray booths, hoods, ovens, dust collectors, ventilators, and other plant equipment exhaust air to the outside. Without a controlled introduction of air to “make up” for the exhausted air, an air-starved environment will result. Some units are designed to heat the air in applications where indoor air is forced to mix with outdoor air in cases such as overhead opening doors.

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