Air Filters in Intake vents?

[EJC+1]

We have noticed that none of our air intake vents in our new house that we built have air filters.

There is obvious a main filter in the furnace that we change every 3 months

Do we need to put smaller filters in the intake vents?

 

[Friday]

No. If there is a filter in the unit, do not put filters at the grill. You can do one or the other, but not both. It will restrict air flow and most likely shut off your entire system.