A Thybar Corporation Multi-Zone Retro-Mate® is custom-made to adapt the existing roof curb and zoning to the new rooftop units. It saves time and costly roof reconstruction, preserves roofing integrity, reduces system downtime, and takes advantage of existing ductwork and zones. Thybar’s comprehensive library of new and old rooftop specifications allows us to design a matching Multi-Zone Retro-Mate® without extensive fieldwork. Reduced engineering and construction time lets you bid more competitively. Thybar Corporation, 913 S. Key St., Addison, IL 60101. 800/666-CURB. Fax: 630/543-5309. E-mail to [email protected]. Website: www.thybar.com— Thybar Corporation.