An 86,000 Btu furnace and a 39,000 Btu water heater are being installed in a new home. Units will have vertical round ducts installed to provide air and they will terminate in the attic space. The panels being used have 1/2″ x 4″ slots w ith wire mesh behind. How many slots are required on both ends of the attic for the required amount of free air into the attic? (75% free air in slots)

An 86,000 Btu furnace and a 39,000 Btu water heater are being installed in a new home. Units will have vertical round ducts installed to provide air and they will terminate in the attic space. The panels being used have 1/2″ x 4″ slots w ith wire mesh behind. How many slots are required on both ends of the attic for the required amount of free air into the attic? (75% free air in slots)