Type QLF
16Pages

Displacement flow diffusers for installation on a wall Type QLF Rectangular casing, one-way or three-way air discharge, for industrial and comfort zones Slender, space saving displacement flow diffusers in an unusual design with chamfered front edges ■■ Nominal widths 300 – 1250 mm, nominal heights 450 – 2000 mm ■■ Volume flow rate range 15 – 865 l/s or 54 – 3114 m³/h ■■ Perforated plate, square pitch QLF-3 ■■ Rectangular duct connection ■■ Duct connection at the top or bottom ■■ Equalising element (perforated sheet metal basket) Optional equipment and accessories ■■ Exposed surface in RAL CLASSIC colours ■

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 details Basic information and nomenclature Application – Type QLF displacement flow diffusers are used as supply air units for industrial and comfort zones – 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, causing...

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, such as auditoriums or shop floors, with several regularly arranged...

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. QLF-*-1, height 450 – 1000, 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 QLF-*-1, height 1250 – 2000, 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 QLF-*-3, height 450 – 1000, 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 QLF-*-3, height 1250 – 2000, 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 and industrial zones with special demands on architecture and design. With one-way or three-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...

Displacement flow diffusers for installation on a wall Order code  Type QLF Displacement flow diffuser  Exposed surface No entry: powder-coated RAL 9010, pure white P1 Powder-coated, specify RAL CLASSIC colour  Connection Rectangular spigot O Top U Bottom  Air discharge 1 One-way 3 Three-way Gloss level RAL 9010 50 % RAL 9006 30 % All other RAL colours 70 %  Nominal size [mm] B × H Order example: QLF–O–3/450×750/P1–RAL 9016 Rectangular spigot at the top Three-way 450 × 750 mm RAL 9016, traffic white, gloss level 70 % Connection Air discharge Nominal size Exposed surface  Type QLF-BM...

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. QLF-U-1

Displacement flow diffusers for installation on a wall

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,...