Presentation Overview

Make-up air systems are designed to replace air that is exhausted from a building by processes such as commercial kitchen hoods, industrial exhaust fans, paint booths, and general ventilation — without adequate replacement air, negative building pressure develops, causing backdrafting of combustion appliances, difficult door operation, uncomfortable drafts, and degraded exhaust system performance.

Codes including IMC, IBC, and ASHRAE 62.1 establish minimum requirements for make-up air in commercial and industrial occupancies, and in many jurisdictions a dedicated tempered make-up air unit is mandatory any time exhaust rates exceed a defined threshold.

Make-up air units are available in a wide range of heating configurations — including direct-fired, indirect-fired, electric, and heat pump — and can be paired with energy recovery, evaporative cooling, and direct expansion cooling sections to condition incoming air before it enters the occupied space.

Proper system design also requires careful attention to interlocks and control strategies that coordinate the make-up air unit with exhaust fans, rooftop units, and building automation systems to maintain neutral or slightly positive building pressure across all operating modes and seasons.

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