The Dual 9 is the only paneled MERV-9A air filter guaranteed to last 9 to 12 months. The Dual 9 is the only paneled MERV-9A air filter guaranteed to last 9 to 12 months. Riverdale, Feb. 12, 2021 ...

JOLIET, Ill. — Filtration Group HVAC announced the launch of the FP Dual-Pak, a combination filter with particulate and airborne molecular contamination performance for all types of applications. The ...

A study was made to determine if the two-stage filter would provide better performance than a conventional dual-media filter at a trickling filter plant. Tests were made and indicated by equal or ...

Ahlstrom has announced a major investment in its Taylorville, Illinois facility that will significantly expand the company’s ...

Abstract: We present a novel method for designing a dual-wideband bandpass filter (BPF) with independently adjustable cutoff frequencies. This approach offers potential applications in the microwave ...