Electric Sieving Technology: Produced from not woven polyster fabric with electric characteristics, effectively capturing small particles like dirt and reducing flying contaminants internal Easy Installation and Replaconcredrink: Simply attach the gluey tape to the outside of outlet and install filter. Denial need to remove outlet when replacing dirty sieves Global Size Agreement: Each pack includes 79x39 in (approx. 200x100cm) of filter substance and 118 in (approx. 300cm) of gluey tape, covering over 36 standard occurrences and flexible for not standard measurements Yearlong Security: Furnishes continuous security for your HVAC structure in all periods, ensuring neat air and optimal execution during both season and winter Flexible Planumberebog: Direct current all outlet measurements, grilles, and air outlets