What is Energy Recovery? Energy Recovery Devices Energy Recovery Units Millions of people spend 90% of their day inside, so it's important that the buildings they occupy have a substantial amount of fresh, outside air. ASHRAE 62 ventilation standards recommend that 15 to 60 cubic feet per minute (CFM) of outside air should be supplied for every person within a building. Although this is just a recommendation, many companies apply this as their specification. Heating, cooling and controlling the humidity of this increasing amount of outside air can become costly. MarCraft's Energy Recovery Units are an economical solution to increasing ventilation without dramatically increasing mechanical equipment costs, space requirements and operational costs in new construction and retrofit applications.