However both your furnace and a c share a single filter.
Attic furnace filter.
With forced air systems air gets sucked in through the return vents from all around your house goes through the air filter and then through the hvac system where the air is either heated or cooled depending on what you have your thermostat set to.
Fire hazards can result if there are excess items pressed against the furnace.
With finer filtration fewer airborne contaminates dust particles are allowed to pass through the filter.
The most common airborne contaminates that these filters are tested against tend to include pollen dust mites mold spores dust pet dander.
Attic replacement and deep pleated air filters utilize 100 synthetic fibers high initial efficiency and will not promote the growth of bacteria mold mildew or fungi in normal operating environments.
Merv means minimum efficiency reporting value merv and is an industry standard that measures the overall effectiveness of air filters.
Attic whole house replacement filters.
The filter is probably at the air intake not in the furnace blower unit up in the attic.
Keep the area around your attic furnace clean.
Excessive dust and debris in the furnace area will be pulled into the.