Rumsinlopp

Rumsinlopp is a Swedish term used in building services engineering to describe the opening through which conditioned air enters a room from a central ventilation or air-conditioning system. It represents the room-side interface of the supply air path and is typically realized as a grille, diffuser, or register connected to a supply duct or plenum. In many installations the rumsinlopp includes a damper to regulate airflow and, in some cases, a control device to influence temperature or comfort.

The rumsinlopp is designed to distribute air into the room while balancing comfort, acoustics, and energy use. Different diffuser types are used, including ceiling diffusers, wall grills, and floor slots, with face velocities and throw distances chosen to promote mixing of supply air with room air. Material choices are usually metal or durable plastic, with finishes that suit interior design and ease of cleaning. The installation should ensure accessibility for maintenance and, if applicable, for filter replacement in the associated supply duct.

Placement and performance considerations are important for avoiding drafts, ensuring uniform temperature, and meeting indoor air quality goals. Typical concerns include avoiding direct air streams onto occupants, minimizing noise, and achieving the intended air change rate. Rumsinlopp installations are guided by national and local building and ventilation standards, which address aspects such as leakages, noise criteria, and energy efficiency.

Etymology: the term combines rum (room) and inlopp (inlet) and is used to denote the room-side intake of supply air.