This is a replacement for Honeywell 272682, and AirExchange 181011A, 181011B, and 181011C, which fits Honeywell Energy Recovery Fresh Air Ventilation System (ERV) models ER90 and ER100, AirExchange model 503 series.
Honeywell no longer makes this filter.
Approximately 16-3/4" x 7-1/2" x 1"
Honeywell ER90 series, ER100 series, ER100A1035
AirExchange 503 series
Other Manufacturer Numbers: FX7-1/2x16-3/4x1, CP8.017.5x16.7
Filter Life: Replace every 12 months (Or more often if the filter appears dirty to the point of blocking air flow through the heating/cooling equipment.)