ÖNORM EN 13141-4

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, A category; — installed in the upstream of a duct, B category; — installed in the downstream of a duct, C category; — installed in a duct, or with duct connection upstream and downstream, D category; — 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 EN 13141-5; — mechanical supply and exhaust units which are tested according to EN 13141-7:2021 or prEN 13141-8:2021.