Air Balancing – What Is It?

A professional HVAC (Heating, Ventilation and Air Conditioning) furnace installation is completed when the system delivers the proper CFM (cubic feet per minute) of conditioned air to each room based on its size and conditions.  This air balancing is done to ensure that the air is delivered properly in a “whole house” approach which improves comfort of the occupants, prolongs the life of the system, and minimizes the energy used by the system.   Sometimes, a system must be rebalanced to maintain efficiency.  There are two types of air balances that can be done, a comfort balance or a certified balance.  

A comfort balance can be done by going from room to room and feeling whether sufficient air flow is coming out of the registers, checking the current temperature, and asking the occupants if they are comfortable. If there is not enough air flow, or if the room is too warm or too cool, then that area is not balanced.  The technician must then look for reasons why and fix them.  The fixes might include adjusting or moving registers, installing restrictors or dampers, or just changing where the air blows.  If an occupant feels uncomfortable because the air is blowing directly on them, that needs to be adjusted, too.  Once the adjustments are made, all rooms in the building should feel comfortable to most people and should have adequate air flow.  Remember that there is no one temperature at which everyone is comfortable, and that is why zones have been developed for areas that need to be made warmer or cooler at certain times, or for certain people.

A certified balance is more thorough, more time consuming, and is often done on new buildings prior to occupation.  A certified balance technician installs new filters in the system, ensures that the building is sealed and that all dampers are open.  He/she will take readings at every system opening.  They will then slowly close the dampers until they meet the CFM requirements for the system.  An adjustment made to one damper changes the CFM at all other openings, so the tech has to return to every opening to take readings and make new adjustments resulting from the changes on the previous one.  All of the registers, grills, exhaust fans, and fresh air intake must be “balanced” to meet the system performance requirements.

If you would like more information or advice on the best way to do this for your system, give a call at 317-297-1622.  You can also use our contact page to request a quote or set up an appointment.  We’ll be glad to help you.

Be Wiser – Call Kaiser!

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