Define the odor-control objective
Identify when the concern occurs, which cooking processes are running and which neighboring spaces are affected. A kitchen with a sensitive sidewall or ground-level discharge needs a review of the whole exhaust arrangement, including nearby occupied areas and outdoor-air intakes.
Share the hood, duct and fan plans, airflow in cubic feet per minute, operating schedule and existing treatment. These details help distinguish an odor concern from a smoke-particulate or grease-vapor concern and establish whether the project needs odor treatment, filtration or both.
Choose the treatment role
MOAS is the misting odor-control system: it introduces atomized Odor Neutralizer Solution through remote nozzles in the exhaust airstream. Chemical neutralization changes odor compounds instead of masking them with perfume. No disposable odor-removal filters are used, so this treatment step produces no spent-filter waste. Its wall-mounted cabinet remains outside the duct; nozzle location, dwell time, utilities and calibration require review.
PCU removes smoke particulate and grease vapor from kitchen exhaust with three dry filter stages. Its final stage may use MERV 14 media or optional carbon for a project-specific odor objective. Standard particulate filtration should not be treated as comprehensive odor removal.
PCU’s 18-gauge Type 304 stainless-steel enclosure contains channels for the pre-filters, high-efficiency filters and optional carbon. It sits between the kitchen hood and discharge, before the fan in the documented arrangement. Indoor or outdoor placement is subject to the installation requirements. Stronger odor concerns may call for review of activated carbon as the third stage or for MOAS.
Plan operation as well as installation
Some projects combine MOAS and PCU. Plan space for the filtration assembly, cabinet, solution container and qualified service access as part of one exhaust system. Review filter monitoring, solution replenishment and operating access before equipment locations are fixed.
The design team and authority having jurisdiction review requirements for the particular site. Equipment listing does not establish approval of every installation. Processes outside commercial cooking, including cannabis and industrial exhaust, require individual suitability review before equipment is selected.
PCU is UL Listed under File MH45752. Models EPFA-24 through EPFA-144 were investigated to the UL 8782 Outline of Investigation for Pollution Control Units for Commercial Cooking Operations.