Type QLE
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Displacement flow diffusers for installation on a wall Type QLE Perforated sheet metal basket Rectangular casing, one-way air discharge, for comfort zones Compact height, space saving displacement flow diffusers ■■ Nominal widths 1000 – 1500 mm, nominal heights 150 – 750 mm ■■ Volume flow rate range 15 – 340 l/s or 54 – 1224 m³/h ■■ Perforated plate, square pitch ■■ Rectangular duct connection ■■ Duct connection at the top or bottom ■■ Equalising element (perforated sheet metal basket) Removable diffuser face ■■ Removable diffuser face Optional equipment and accessories ■■ Exposed surface in

Displacement flow diffusers for installation on a wall General information Page General information Function Technical data Quick sizing Specification text Order code Variants Dimensions and weight Installation examples Installation details Basic information and nomenclature Application – Type QLE displacement flow diffusers are used for comfort conditioning applications – Attractive design element for building owners and architects with demanding aesthetic requirements – Floor-standing installation on walls, either individually or several units arranged in a row – Low-velocity airflow,...

Displacement flow diffusers for installation on a wall Functional description Displacement flow diffusers discharge the air from air conditioning systems with a low velocity and near the floor. The low-turbulence airflow creates a pool of fresh air that covers the entire floor area. The convection from people and other heat sources causes the fresh air from the pool to rise and create comfortable conditions in the occupied zone. This draught-free and economical type of ventilation is also suitable for large internal spaces, with several regularly arranged units. Displacement ventilation is...

Displacement flow diffusers for installation on a wall Low-turbulence displacement ventilation airflow pattern Three-dimensional representation Low-turbulence displacement ventilation airflow pattern Side view

Displacement flow diffusers for installation on a wall Technical data Nominal sizes (B × H) Minimum volume flow rate, at 0.1 m/s Maximum volume flow rate, at 0.3 m/s Supply air to room air temperature difference Sound power level, at 0.3 m/s

Displacement flow diffusers for installation on a wall Quick sizing Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures. QLE, height 150 – 450, sound power level, total differential pressure and near zone Nominal size <: 0.2 m/s are not achieved The near zone values are based on a supply air to room air temperature difference of –3 K

Displacement flow diffusers for installation on a wall Quick sizing QLE, height 600 – 750, sound power level, total differential pressure and near zone Nominal size <: 0.2 m/s are not achieved The near zone values are based on a supply air to room air temperature difference of –3 K

Displacement flow diffusers for installation on a wall Specification text This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme. Displacement flow diffusers for air discharge near the floor, suitable for comfort zones with special demands on architecture and design. With one-way air discharge for low-turbulence displacement ventilation. Rectangular casing for installation on a wall. Ready-to-install component which consists of a casing with spigot at the top or bottom, a perforated sheet...

Displacement flow diffusers for installation on a wall Order code  Type QLE Displacement flow diffuser  Connection Rectangular spigot O Top U Bottom  Nominal size [mm] B × H Nominal width B 1000 1250 1500  Exposed surface No entry: powder-coated RAL 9010, pure white P1 Powder-coated, specify RAL CLASSIC colour Gloss level RAL 9010 50 % RAL 9006 30 % All other RAL colours 70 % Nominal height H 150 300 450 600 750 All sizes can be combined Order example: QLE–U/1250×300/P1–RAL 9016 Connection Nominal size Exposed surface Rectangular spigot at the bottom 1250 × 300 mm RAL 901

Displacement flow diffusers for installation on a wall

Displacement flow diffusers for installation on a wall The nominal size (nominal width × nominal height) is equal to the discharge opening.

Displacement flow diffusers for installation on a wall Installation examples

Displacement flow diffusers for installation on a wall Installation details Installation and commissioning – With displacement ventilation and air discharge near the floor, extract air devices should be installed in the upper part of a room, above the occupied zone.

Displacement flow diffusers for installation on a wall Basic information and nomenclature Principal dimensions B₁ [mm] Width of diffuser face B₄ [mm] Width of a rectangular spigot ØD [mm] Outer diameter of the spigot ØD₁ [mm] Casing diameter Nomenclature LWA [dB(A)] A-weighted sound power level of air-regenerated noise  [m³/h] and [l/s] Volume flow rate v0 [m/s] Theoretical airflow velocity across the diffuser area, at a distance of 0 m from the diffuser face Lnz [m] Near zone of the displacement flow diffuser, where the comfort criteria may not be achieved The near zone is at least 0.5 m,...