Grilles the function of a grille is to pull air from a room to return it to the heating or cooling system.
How to install a cold air return floor grille.
This should give you a hole into the basement.
There are zero return registers upstairs 3 bedrooms and 1 bath.
The main floor has 3 supply and 3 return registers all on the floor but the supply is interior and returns are under windows along the exterior.
Through the hole cut through the floor.
That said i am looking at installing central air before summer hits.
First building codes in many areas require that the cold air return line gets external insulation and therefore you will need to leave a gap for the insulation around the duct return line.
Instructions step 1 locate where you want your return air ducts.
The vent cover or grille usually contains a removable filter and is sized to fit between ceiling joists spaced a standard 24.
Size the hole appropriately to the grille size.
Running a metal cold air return duct between studs requires knowledge of both hvac systems and the components involved in framing.
Cut a hole low in the drywall where you want to put your return air grille.
It differs from a register because it does not have a damper to control airflow.
Warm air rises and the return will direct that air to the cooler.