draft beer faqs

What is an Air Cooled dispensing system?

Below are descriptions double air shaft, and single air shaft, Air Cooled system that can be setup with walk-in sized coolers.

In both types of systems, cold air from the walk-in cooler box is forced to the dispense tower, and then returned to the cooler. This forms a continuous air loop, along side beer hoses to keep them cold. This system tries only to maintain the air temperature from the walk-in. Beer is not additionally cooled in the air shaft.

A walk-in that is used for food storage and continuously opened is not good for either of these applications due to fluctuations in the walk-in air temperature. The Air Cooled system cannot be more than 25 feet overall from walk-in to the dispense tower. Blower: Size of the blower is determined by the distance from walk-in to dispense tower, and the number of bends in the shaft.

DOUBLE AIR SHAFT SYSTEM — Dispensing Up To 25 Feet

Air Cooled System

The double duct keg beer system is defined as two ducts with a blower for continuous air circulation. One duct is for the cold air supply from the walk-in-cooler to the point of dispense. The second duct is for the cool air to return from the point of dispense back to the walk-in cooler. 

Usually, the double duct system is used in conjunction with a shaft box or double pedestal draft beer tower to insure proper return of air to the walk-in cooler.


SINGLE AIR SHAFT SYSTEM — Dispensing Up To 25 Feet

Air Cooled System

Walk-in cooler air is blown through the smaller (inner) duct and returned to the cooler through the larger (outer) duct. Usually, an air separator kit and a baffle plate are required in the draft beer tower to insure proper air circulation. This type of a system is used with a single column beer tower.

A walk-in that is used for food storage and continuously opened is not good for either of these applications due to fluctuations in the walk-in air temperature. The Air Cooled system cannot be more than 25 feet overall from walk-in to the dispense tower. Blower: Size of the blower is determined by the distance from walk-in to dispense tower, and the number of bends in the shaft.