Replacement filter insert fits Aprilaire and Space-Guard furnace model numbers 2400.
- Replaces original Space-Gard part number 401.
- This is an accordian-style standard filtration replacement that expands to fit inside your filter frame assembly
- Aftermarket, NOT made by Lennox
Includes: 12 Filters
Also Fits Lennox Models: PMAC12C PMAC12-C PMAC-12-C
Original part number; SG4, 401.