When air is taken from your kitchen exhaust system, it must be replaced by clean, fresh air in order for your kitchen to stay in top shape. This is where make-up air becomes so important. 

Make-up air us outside air that is brought into a restaurant through the ventilation system. Having a source of make-up air that delivers clean outdoor air consistently is the best way to ensure your ventilation is providing you with the best possible results. 

An establishment that does not have enough make-up air being delivered will develop negative pressure. Having negative pressure in your establishment can significantly lower the performance of your kitchen exhaust system and cause uncomfortable conditions for both employees and customers.

Some signs of an establishment with insufficient make-up air provided:

1. The building has temperature changes that can be felt when moving from one area to another
2. Doors leading to the exterior will slam shut when left open
3. Ventilation systems will not perform optimally 
4. Cold air can be felt coming in through any cracks or other openings

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