Return Air Duct Size
The new hallway return duct will also enter this metal duct box with the filter below that feeding back into the furnace.
Return air duct size. Size of air conditioner (example: As the trunks are reduced use the total cfm of the remaining downstream branches. For sizing the supply and return trunks select the duct size at the intersecting lines of the friction rate and the equipment cfm.
Thinking about conservation laws, we can safely assume that every bit of air that enters the duct on the left has to come out of the duct somewhere. Tees split, but do not reduce, and an appropriate reducer must be added. If the furnace is putting out 1,000 cubic feet per minute of air flow, the return system must collect 1,000 cubic feet and take it back to the unit.
In order to maintain velocity, reduce duct size. • the chart is based on metal duct. A mismatch in return air inlet grille or duct size will reduce the system's effectiveness.
The sensible heat ratio is useful in finding g, the moisture content of air, at different conditions using a psychrometric chart. If the supply ducts are in the floor, then the return air should be located up high. The size of the filter at the air handler gives a clue about the anticipated size of the air return that equipment manufacturer expected to have.
Table 4.2 return air duct installation sizes (based on.05 inches of pressure drop per 100 ft.) round duct rectangular duct cfm dia. This total 93sq which exits above the furnace into a metal mixing box. They are return air filter grills.
The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. Without the return duct, the air in the home would not be able to properly circulate. On the system depicted in figure 3 , there was no chance for return air to make it back to the equipment.
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