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.
Wider buildings use additional center-ceiling inlets.
The inlet baffle adjustment is sized such that air will enter at a speed of 800 feet per minute. This will cause the air to be thrown further into the building and cause proper air mixing. The throat of the inlet should be sized at least big enough to accommodate the hot weather ventilation rate. Continuous inlets should be discontinued within 5 feet of sidewall fans. Example Step 5.