3840 cfm Fan test data is examined to find adequate fans. This will be selected as our continuously running minimum ventilation fan. Two of these will be used as the second and third ventilation stages. This means that at three stages, only 6761 cfm will be provided. To summarize, the actual fan stages appear below.
Actual fan stages for the example.
Inlets can be made with continuous slot inlets or commercially available, self-adjusting inlets. These two cases will be handled separately below. Continuous Slot Inlets Continuous slot inlets, Figure 1, are used to bring air from the attic in winter and the eave in the summer. They generally are adjusted by hand to different season conditions. These are generally used on one eave for buildings 20' wide or narrower and on both sides for buildings 20 to 40' wide.