WAREHOUSE DEAL 12x25x1 Koch Disposable Polyester Panel Filter (12 Filters)

The Koch Disposable Polyester Panel filter in 12″ × 25″ × 1″ is a budget-friendly panel filter built for equipment protection and high airflow. Polyester media is tougher and more durable than spun fiberglass — it holds its shape better in high-airflow installations and doesn't shed fibers into the airstream. Equipment protection first, filtration second Like other MERV 1–4 panel filters, Koch disposable polyester is designed to protect the coil and blower from lint, hair, and large debris — not to filter fine dust or allergens. For allergen-level filtration, step up to a pleated MERV 8 or higher. Understanding the MERV 1–4 rating Fiberglass media is rated MERV 1 when clean and builds up to MERV 4 as dust loads onto the fibers. That's not inconsistency — it's how spun-glass media works. A fresh filter lets the most air through while still blocking larger debris; as dust collects, the media becomes more efficient at catching finer particles. The goal of a MERV 1–4 filter isn't air quality — it's equipment protection with maximum airflow. It keeps lint, hair, and large dust out of your coil and blower, which is exactly what older systems, high-airflow applications, and pre-filter duty need. Construction Media: Polyester synthetic panel media with tackified downstream surface for improved particulate retention. Frame: One-piece moisture-resistant beverage-board. Service life: 30–60 days under typical use. Spec sheet Download Koch Polyester Panel spec sheet (PDF) Also worth considering Shopping on price? Our house brand PrimeShield MAX Airflow (MERV 1–4) covers the same efficiency tier across common residential and commercial sizes and is usually the better value. Choose this branded option when your equipment spec sheet or facilities team calls for it specifically. Questions on fit, quantity, or a commercial quote? Need a size that isn't listed, a different pack count, or a quote for a commercial order? Get in touch — we handle facilities and commercial orders daily and can usually match or beat distributor pricing.