The best location for an air return is a hard a hard question to answer first of all. If you have a forced hot air type of heating, your return has already been chosen for you. If this is a retro fit air system, the return is chosen by the installer. In this situation there is usually space between two ceiling joists that are located at the most central area where he or she can find. With the information given this is the best answer you will probably get
The ideal location would be close to the floor, but the house structure limits location. It is common to see air return grilles on walls or ceilings.
Return air vents in each room (none in bath or restrooms) sized for the amount of cfm needed for that specific room are best but if this is not possible then pick a central location and return vent should be sized for total cfm required of house.
The best thing to use to block a cold air return is a piece of a cardboard box cut to fit the size of the return. Other options include towels or blankets.
The location is best for respiration. The air is not restricted to a curved or misshapen pathway that causes delays in air being drawn into the lungs.
You will hear air circulating in the cold air return (or return air grille) when the heater or air conditioner is running.
That depends on the location from were you are renting and where you are looking to return the car.
Your best bet is to look on the web for "air gun repair" and find a location to repair it for you.
A cold air return is similar to a return air grille, which is needed for air to travel to the furnace to be filtered, heated OR cooled and then recirculated.
return point
If you are using it outdoors for weather measurement, then a location sheltered from the wind is best. If you are using it indoors to monitor laboratory conditions, then a location which is free of drafts is best. That is, avoid placing it near air ducts. The general rule for a barometer is to place it in a location with a low amount of air circulation, so that you can measure the static pressure. Also keep in mind that you want to be able to read the instrument.
A return air grille is where air returns to the furnace to be filtered and heated or cooled and re circulated through the air supply grilles.
Cold air return vents are the ones on the wall