The SPT-10 PAD measures 21"x30" and comes in a pack of 25, designed by Koch Filter Corp. This high-efficiency pad is ideal for air filtration applications, ensuring optimal performance in various HVAC systems. Constructed with durable materials, it effectively captures airborne particles, enhancing indoor air quality. The pad's dimensions make it suitable for a range of standard filter frames, and it complies with industry standards for filtration efficiency. Perfect for commercial and residential use, the SPT-10 PAD is a reliable choice for maintaining clean air.