Barn Testing

The U.S. Tobacco GAP Program requires that flue-cured tobacco barns be tested every 3 years to check for leaks in the heat exchange. Barn testing measures the carbon dioxide (CO2) levels inside an empty flue-cured tobacco barn to assess if combustion products are leaking from the heat exchanger into the curing chamber. Carbon dioxide is not related to the formation of tobacco-specific nitrosamines (TSNAs) but is used as an indicator of a heat exchanger leak.

Training to Certify Barns

Growers and gas repair technicians must be trained by someone from Cooperative Extension (Georgia, Clemson, North Carolina State, or Virginia Tech) in order to certify tobacco barns. At the training, participants will receive the proper training and a certificate of attendance that will allow the participants to certify tobacco barns. The training workshops are generally 1 hour. At these workshops, participants will receive information on where to purchase a meter, if interested in purchasing their own meter. Please check the Calendar for Barn Testing Workshops.

View or Register for Training Events

Download the U.S. Tobacco GAP Program Flue-cured Tobacco Barn Testing Protocol

Download the Final US Tobacco GAP Barn Testing Report Sheet


Request Training on your Transcript


GAP Connections will provide for the scanning of Grower ID cards at Barn Testing Certification Training.  If you attended training and have a Grower ID card but did not get it scanned please send GAP Connections a copy of the training certificate with your Grower ID Number listed on it.

GAP Connections
2450 E.J. Chapman Drive
Knoxville, TN 37996

Office: 865.622.4606
Fax: 865.622.4550

Non-Growers (Barn Service Providers)

If you are not a GAP Connections Grower Member and do not meet the requirements to become one but want to receive communication from GAP Connections on Barn Testing Certification and other U.S. Tobacco GAP-related topics please complete the form below.

‚ÄčDownload the Barn Service Provider Contact Form


Additional Resources

Please visit the University of Georgia Tobacco Barn Retrofit Website for additional resources on retrofitting, curing and energy conservation publications, heat exchanger information, types of steel, equipment manufacturers, fuel costs and consumption, and how to make a wet-bulb thermometer.