A Thybar Multi-Zone Retro-Mate is custom made to adapt your existing roof curb to a new rooftop unit. It saves time and costly roof reconstruction, preserves roofing integrity, reduces system downtime, and takes advantage of existing multi-zone ductwork. Convert a single-zone constant or variable-volume rooftop unit into a variable-volume multi-zone. The company’s comprehensive library of new and old rooftop specifications lets its engineers design a matching Retro-Mate without extensive field measurements. Reduced engineering and construction time lets you bid more competitively. Licensed P.E. on staff. Retro-Mates 25 ton and under can be built in three days from the company’s extensive list of drawn Retro-Mates.