Strange but true - if I install another 14x30x1 filter brand (I've tried three other brands), my house will literally spit the filter out! Our air intakes are in the ceiling and Filtrete is the only brand that stays in place. The metal covers of the intakes will open on their own and the "other brand" filters fall out within three weeks, but Filtrete filters fit and stay put for 3+ months. It's like our house knows when we're trying to pull one over on it! Eerie....