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Trane
Replacement Filter
Trane 16-1/4" (Side Return Furnace), 16-1/4" (Side Return Furnace) Wide, fits $52.28, Filter Only | FLRSF1165
$77.99
The right replacement filter, changed on schedule, protects both your air and your equipment. Filters come in specific sizes and MERV ratings — match yours, and don't jump to a denser filter than your system is built for.
28 products
Trane
Trane 16-1/4" (Side Return Furnace), 16-1/4" (Side Return Furnace) Wide, fits $52.28, Filter Only | FLRSF1165
Trane
Trane 16.5" (Side Return Furnace) Wide, fits Side Return Filter Rack 16x20 1", Filter & Frame | BAYSF1165BAA
Trane
Trane 17.5" Wide, fits Air Handler, MERV 13, Filter Only | FLRQB5DN17M13
Trane
Trane 17.5" Wide, fits Furnace, MERV 13, Filter Only, for 17" Cabinet | FLRQB5FR17M13
Trane
Trane 18.5" Wide, fits Air Handler, MERV 13, Filter Only, for 18" Cabinet | FLRQB5AH18M13
Trane
Trane 18.5" Wide, fits Matches Cabinet Size 18.5", Filter & Frame | BAYSF1185BAA
Trane
Trane 18.5" Wide, fits Matches Cabinet Size 18.5", Filter Only | FLRSF1185
Trane
Trane 20" Wide, fits Air Handlers, MERV 11, Filter Only, for 18" Cabinet | FLRQB5AH18M11
Trane
Trane 20" Wide, fits Air Handlers, MERV 11, Filter Only, for 21" Cabinet | FLRQB5AH21M11
Trane
Trane 20" Wide, fits Air Handlers, MERV 11, Filter Only, for 23" Cabinet | FLRQB5AH23M11
Trane
Trane 20" Wide, fits Air Handlers, MERV 11, Filter Only, for 26" Cabinet | FLRQB5AH26M11
Trane
Trane 20" Wide, fits Furnaces, MERV 11, Filter Only | FLRQB5DN17M11
Trane
Trane 21.5" Wide, fits Air Handler, MERV 13, Filter Only, for 21" Cabinet | FLRQB5AH21M13
Trane
Trane 21" Wide, fits Furnace, MERV 13, Filter Only, for 21" Cabinet | FLRQB5FR21M13
Trane
Trane 23.5" Wide, fits Air Handler, MERV 13, Filter Only, for 23" Cabinet | FLRQB5AH23M13
Trane
Trane 23.5" Wide, fits Matches Cabinet Size 23.5", Filter & Frame | BAYSF1235BAA
Trane
Trane 23.5" Wide, fits Matches Cabinet Size 23.5", Filter Only | FLRSF1235
Trane
Trane 2-3 Ton Package Units, 2-3 Ton Package Units Wide, fits $77.90 | BAYFLTR101C
Trane
Trane 24.5", 24.5" Wide, fits $44.08 | BAYFTFREXM2
Trane
Trane 24.5" Wide, fits Furnace, MERV 13, Filter Only, for 24" Cabinet | FLRQB5FR24M13
Trane
Trane 25" (Side Return Furnace), 25" (Side Return Furnace) Wide, fits $67.65, Filter Only | FLRSF1255
Trane
Trane 25" Wide, fits Side Return Filter Rack 16x25 1" (bottom return for 17.5" cabinets), Filter & Frame | BAYSF1255BAA
Trane
Trane 26", 26" Wide, fits $43.05 | BAYFTAHEXM2
Trane
Trane 26.5" Wide, fits Matches Cabinet Size 26.5", Filter & Frame | BAYSF1265BAA
Trane
Trane 26" Wide, fits Furnaces, MERV 11, Filter Only, for 17" Cabinet | FLRQB5FR17M11
Trane
Trane 26" Wide, fits Furnaces, MERV 11, Filter Only, for 21" Cabinet | FLRQB5FR21M11
Trane
Trane 26" Wide, fits Furnaces, MERV 11, Filter Only, for 24" Cabinet | FLRQB5FR24M11
Trane
Trane 3.5-5 Ton Package Units, 3.5-5 Ton Package Units Wide, fits $82.00 | BAYFLTR201C
Two things matter: the exact dimensions (printed on your current filter) and the MERV rating, which measures how fine a particle it catches. A higher MERV filters more but can restrict airflow if the system isn't designed for it, so balance cleaner air against your equipment's limits — and change it on schedule.
Have a question about the right fit for your setup? Reach out and we'll help →
A 1-inch filter typically needs changing every 1–3 months; thicker media filters can last 6–12 months. Pets, allergies, and heavy use shorten the interval.
Not if it's too dense for your system — it can restrict airflow and strain the blower. Match the MERV to what your equipment is designed for, or use a media cabinet built for high filtration.