The best location of the return vents depends on whether the system is heating or cooling the air.
Central heating air vent location.
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If it s cooling the return vents should be near the ceiling where the warm air collects but if.
Unlike supply vents return vents do not need to be cased in metal.
For the best energy efficiency what is the optimum place to put the vents in each room for the new a c forced heating system ceiling high on the wall.
The low vents stay closed in the summer and the high vents stay closed in the winter.
Some systems have two sets of return vents one up high for warm air and one low to the floor for cool air.
Sometimes vents get blocked by rugs couches or the like.
Try to avoid doing this to your vents as it will reduce their efficiency.
Ducts should always be located within the conditioned envelope of the building ideally within the framing of floors ceilings and walls and they should be maintained so air does not leak out of.
Attic systems may use registers placed in the ceiling instead.
Place your cold air return vents on the inside walls of buildings at the lowest point.
The return vent pulls cold air from the bottom of the room and returns it to the furnace to be reheated and returned as warm air.
Re best location of airbottle vent in central heating system i have a potterton boiler 60e connected to megaflow in the loft with bottled airvent in the flow and also in the return pipe in the loft near the megaflow tank the boiler is located on the ground floor in the garage with grundig pump.