FG Furnace Filters
FG (Filtration Group) Aerostar pleated furnace filters in standard sizes from 1 to 5 inches deep, including 5-inch filters built as Honeywell, Lennox, Trion and Air Bear replacements. Choose Series 400 (MERV 8 or 10), Series 1100 (MERV 11) or Green Pleat (MERV 13), then match your filter size.
See all furnace filters, or browse 4 inch furnace filters and 5 inch furnace filters for media cabinets. Our MERV rating guide explains the ratings.
FG Aerostar guide: series, MERV and sizes ▾
FG Aerostar series at a glance
| Series | MERV | Depths in this collection |
|---|---|---|
| Aerostar Series 400, Standard Capacity | 8 | 1, 2, 4 and 5 inch |
| Aerostar Series 400, High Capacity | 10 | 1, 2 and 4 inch (plus a 16x25x5) |
| Aerostar Series 1100 | 11 | 1, 2, 4 and 5 inch |
| Aerostar Green Pleat | 13 | 2 and 5 inch |
| Filtration Group IAQ Pleated | 13 | 1 and 4 inch |
| Aerostar FP Mini-Pleat | 15 | 24x24x12 |
Matching 5-inch filters
Each 5-inch FG filter title says which cabinet it replaces. A 20x25x5 is made in a Honeywell and Lennox version and a separate Trion and Air Bear version, so check the brand of your media cabinet as well as the size.
Finding your size
Use the size printed on your old filter's frame, such as 16x25x1 or 20x20x4, and match all three numbers. Check your filter monthly; most 1-inch filters are changed every 1 to 3 months, and deeper 4 and 5 inch filters last longer.
