Our Prairie Heating In-Slab Duct System provides the best duct ventilation system for condominiums and high-rise buildings. The primary use of our Prairie Heating Slab Duct is to exhaust air from bathroom fans, range hoods and clothes dryers but can also be used for fresh air intake and supply air from the HVAC system. Our HVAC in-slab duct system eliminates bulkhead and creates a more aesthetically pleasing look vs. traditional exhaust coming from balconies.