VEVOR Active Carbon Filters, 3 Pack, 15.7'' x 15.7'' Air Filter Replacement, High-efficient Stage 2 Filters Compatible w/ BlueDri & VEVOR Scrubber, Air Purifiers, Water Damage Restoration Equipment

The filter should be replaced every 3 months, but if the environment is very harsh, the frequency of filter replacement will be higher.

The dimensions of B-Air RA-650 are the same as our product, which should be compatible.

In the absence of sunlight, it should be fine for two to three years.