Air Filter

Can I do away with my furnace filter and install a return grille air filter instead?

I would rather have a return grille air filter instead of using a furnace filter because of the confined space my central air/furnace is located in.
Also, out of sheer curiosity. Are there any repercussions in using both filters?

Francis G is right, with one other note. The assumption is that you only have one return air grille. If you have multiple return airs, you would need a filter in each one. That’s why you usually find the filter in the unit, because it will filter all of the return air, including any outside air that might be brought in through the ductwork (not common in residential though).

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MILLER 228926 PLASMA AIR FILTER for most brands $85.77

MOTOR GUARD PLASMA AIR FILTER for most brands $117.87

MILLER 228928 PLASMA AIR FILTER REPLACEMENT ELEMENT $15.07

MOTOR GUARD PLASMA AIR FILTER REPL. CART M-723 CASE/4 $39.87

Air regulator and filter for plasma cutter shipped by priority mail $0.99

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Miller 042306 Mg Air Filter $229.38

Thermal Dynamics 7-7507 AIR FILTER KIT $149.33

Miller 228928 Element,Filter Air Replacement In-Line Pk $18.09

Miller 228926 Kit, Air Filter In-Line $100.73

Thermal Dynamics 9-9387 Two Stage Air Filter Kit $211.00

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MOTORGUARD M-26 PLASMA AIR FILTER for all Plasma Cutters–filter only $87.87

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Motor Guard M-723 Air Filter Replacement Element 4 pk. $32.00

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NEW MILLER WELDER PAPR PARTICULATE HEPA AIR FILTER $21.99

NEW BOSTON GEAR AIR FILTER EN61350-MG EN61350MG 3/4″ NPT $45.00

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MOTOR GUARD PLASMA AIR FILTER $86.99

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MotorGuard Mg M-26 Air Filter 1/4″ NPT $102.82

MotorGuard Mg M-60 Air Filter 1/2″ NPT $78.85

CLEANER,AIR#50250,HEPA,WE $413.44 Enviracaire HEPA Air Purifier w/Carbon Pre-Filter, 374 sq ft Room Capacity

CLEANER,OFFICE AIR,BKSR $269.98 Office Air Cleaner w/Filtrete Media Filter, 192 sq ft Room Capacity

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FILTER,AIR,F/OAC150,WE $45.58 Replacement Filter, 11 x 14 1/2

FILTER,AIR,F/OAC250,WE $68.85 Replacement Filter, 11 7/8 x 18 3/4

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FILTER,AIR,PRJCTR,ELPAF29 $15 Replacement Air Filter for PowerLite Series