AC Safe 20x20 Inch Polyester Box Fan Filter with 4 Clips - Replacement Air Filter for Home, Office & HVAC Systems - Improves Indoor Air Quality

Why would you pay over 4 times the suggested retail for this? Especially when you can get a more efficient 4-6 pack of Merv 6-13 20X20X1 furnace filters, for a lower price and better result?Also: Each furnace filter used will suck right up to the back of most Lasko box fans even on the low speed and each filter will last for a month or more even with a smoker's use!