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.
Hvac attic filter.
Which direction does the filter need to be facing.
If your hvac system is in your attic the air filter may be in a vent in the ceiling.
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.
The filtrete 1900 maximum allergen reduction filter is impressive at removing dust pollen and smoke from the air when the hvac system is running on its highest fan speed earning an.
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.
On vertical air handlers with the return air duct entering on the top of the air handler the filter often slides into a slot above the hvac unit.
This can change however depending on where your unit is installed.
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