If your hvac system is in your attic the air filter may be in a vent in the ceiling.
Hvac attic filter.
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You ll find a few levers that you can move to open the vent.
The filter is easy to grab in fact it may fall out of the vent if it isn t snug so be ready for that.
If your hvac unit is installed in your attic for example then your filter may be installed in an air vent instead of a return duct.
This can change however depending on where your unit is installed.
On horizontal hvac units with the return duct attached to the side of the air handler the filter often fits in a slot on the return air intake side of the unit.
In a traditional hvac system your air filter is usually installed between your hvac unit and your return duct.