BS EN 13141-4:2021

This document specifies aerodynamic, acoustic and electrical power performance test methods for unidirectional ventilation units used in residential ventilation systems.This document is applicable to ventilation units: installed on a wall or in a window without any duct, Acategory; installed in the upstream of a duct, Bcategory; installed in the downstream of a duct, Ccategory; installed in a duct, or with duct connection upstream and downstream, Dcategory; with one or several inlets/outlets; installed in a system with a heat pump for domestic hot water or water for cooling or heating; which can be used for supply or exhaust. This document does not apply to: fan assisted cowls which are tested according to EN13141?5 ; mechanical supply and exhaust units which are tested according to EN13141?7:2021 or prEN13141?8:2021 .