Review on Carbon Pad Pre Filter Roll: Universal Fit for Air Purifiers, Furnace Filters, and Air Conditioner Filters by Travis Rio

I can't rate the activated carbon filter yet because I haven't used it yet. I'm wondering if they can be used for both the large 23" x 23" air conditioner intake vents in the house and the exhaust vents in the house. Lately I've noticed that the exhaust vents are getting very dusty. although an additional (expensive) Honeywell electronic air filter is installed in the garage along with the main stove/AC/AC. I just had my Honeywell Furnace/AC Plus electronic filter serviced today but the technician didn't want to take responsibility. to install them on the ventilation openings. Does anyone know if it's safe to use them this way? I will update my review once I use it.