The new make up air regulations are challenging everyone. On one particularly tough project we were asked to remove an island downdraft vent and replace it with an over the island hood vent from Vent-a-Hood. The counter top on the island was a discontinued 12×12 granite tile making the repair also a challenge. The hood vent was rated at 600 cfm putting us over the 400 cfm threshold for required make up air.
One problem with make-up air is; following the code usually requires bringing in cold outside air in the winter. This HRV unit meets the code requirements while heating the cold air in the winter allowing for a comfortable home year round. The guys at Lakeside Heating & Cooling did a great job engineering this system.