This Trion Air Bear 16x25x5 replacement furnace filter is a PREMIUM MERV 13 aftermarket replacement manufactuered by FilterBuy.. It is designed to be a preium, best in class, MERV 13 replacementfor Trion Air Bear Cub models 229990-105, 255649-105, Trion Air Bear Supreme model 435790-028, as well as Trion Air Bear Supreme (1400) 455602-121. These filters have pre-applied gasketing to ensure a tight seal. A word on 16x25x5 air filters: note that there may be different ACTUAL sizes of filters that are nominally 16x25x5 furnace filters. This filter is designed to replace those manufactured by Trion Air Bear that are nominally 16x25x5, though it can also fit other brand units. The actual size of these filters measures 15 5/8 x 24 1/8 x 4 7/8. Please make sure that you compare the nominal and actual size of the furnace filter that you are replacing. This AFB Platinum MERV 13 replacement filter is designed to last 6 months. The filters ship directly from the manufacturer to your doorstep, allowing AFB the ability to offer a premium product at a reasonable price. Each quantity purchased is for a Pack of 4 MERV 11 filters. Note that AFB 16x25x5 Air Bear replacement filters come in AFB Silver (Merv 8), AFB Gold (Merv 11), and AFB Platinum (Merv 13). The AFB Platinum MERV 13 replacement is the top of the line replacement, utilizing high-end filtration technology that filters out all by the tiniest of dust particles, allergens, and other pollutants. We recommend the MERV 13 filter for premium home use.. 100% made in the USA using all USA materials. FilterBuy: Breathe Better!