Air balancing is the process of taking an approved by the government paper calculation and seeing if you can get the same number in real life. Normally your blueprints are located in the city planners office. You can simply pick up a copy if needed. ECHO test and balance Pembroke Park is 24hrs a day. We have 3 shifts for after hours needs. A technician and an inspector will walk your air ducts to see if the proper calculation of air flow from a duct matches your approved calculation on your blueprint. Call anytime. We service same day to Pembroke Park.