There are several filters in each apartment. In some buildings – and in this one in past years – filters were routinely changed twice a year, at the start of the heating and air-conditioning seasons.
Now, it is necessary to fill out work orders to get filters changed. This is well worth doing, because clean filters help both with air flow (and hencetemperature control) and with the control of odors from other units. This is an old building, and it is not possible to close the air vents running through the ceilings, so there is seepage of odors.
