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Linear slot air diffusers for ventilation are linear air distribution components designed for supplying air to rooms and extracting it from them. They are used in mechanical ventilation and heat recovery systems in residential buildings, offices, retail spaces and other commercial premises. The el-vent.com range includes the aluminium PLD series, available with one, two, three or four airflow slots. Each slot has a damper for airflow adjustment. The diffusers are suitable for warm and cold air and have a white RAL9016 powder-coated finish. Models are available in lengths of 490 and 985 mm. Compatible PLDD plenum boxes can be used to connect the diffusers to ductwork.
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Linear slot air diffusers are elongated ventilation components featuring one or more narrow airflow slots. They are designed to distribute supply air within rooms or collect air for extraction, making them suitable for both supply and extract ventilation systems.
These products are also called slot diffusers, linear air diffusers or ceiling slot diffusers. Their elongated design provides linear air distribution and complements modern architectural and interior design solutions.
The el-vent.com range includes the aluminium PLD series, consisting of five models with one, two, three or four slots. The diffusers have individual airflow dampers in each slot and can be used for distributing warm or cold air.
PLD are aluminium linear air diffusers intended for mechanical ventilation and heat recovery systems. Their surfaces have a white RAL9016 powder-coated finish.
A key feature of the PLD series is the ability to adjust airflow separately in each slot. This allows the diffuser operation to be adapted to the required air distribution, subject to the model's technical characteristics and the ventilation system design.
PLD diffusers are designed for both air supply and extraction and are suitable for warm and cold air.
PLD1/495 is a single-slot aluminium diffuser with a length of 490 mm and an H dimension of 44 mm. It is suitable where a single linear air distribution opening is required and the calculated airflow is compatible with the model's performance.
PLD2/495 and PLD2/990 are two-slot diffusers with lengths of 490 and 985 mm respectively, and an H dimension of 88 mm. Two separate slots offer additional possibilities for airflow distribution and adjustment compared with a single-slot design.
PLD3/990 is a three-slot aluminium diffuser with a length of 985 mm and an H dimension of 132 mm. It can be selected when a wider linear air distribution component is required.
PLD4/990 is a four-slot aluminium diffuser with a length of 985 mm and an H dimension of 176 mm. The additional slots offer greater air distribution flexibility, although suitability for the required airflow must be verified against technical data.
| Model | Number of slots | Length L | Dimension H |
|---|---|---|---|
| PLD1/495 | 1 | 490 mm | 44 mm |
| PLD2/495 | 2 | 490 mm | 88 mm |
| PLD2/990 | 2 | 985 mm | 88 mm |
| PLD3/990 | 3 | 985 mm | 132 mm |
| PLD4/990 | 4 | 985 mm | 176 mm |
Dimensions L and H are given in millimetres according to the product's technical table. Before ordering, check the installation drawings, connection arrangement and compatibility with the selected plenum box.
PLDD are air distribution boxes used to connect PLD slot diffusers to a duct system. The box forms the connection between a round duct and a linear diffuser.
The PLDD series includes different dimensions for corresponding diffuser lengths and slot configurations. Depending on the model, the round duct connection diameters are Ø125, Ø160 or Ø200 mm.
PLDD boxes can be supplied with additional acoustic insulation by special order. The box dimensions, configuration and insulation options must be checked for compatibility with the particular PLD diffuser and the ventilation design.
The PLD range includes diffusers with one, two, three or four slots. More slots provide additional airflow openings, but the correct model must be chosen according to the design airflow and technical performance rather than slot count alone.
Two actual lengths are available: 490 and 985 mm. Shorter diffusers may suit locations with limited installation space, while longer models are suitable where an extended linear air distribution opening is required.
PLD diffusers are universal and can be used for both supply and extract air. Supply air applications require consideration of distribution patterns within the room, while extraction applications require appropriate extract airflow and pressure loss characteristics.
Selection requires knowledge of the design airflow (m³/h), permissible pressure loss (Pa) and acoustic requirements. The PLD technical documentation provides airflow, air throw distance, pressure loss and noise performance data.
Damper position can also influence aerodynamic resistance and airflow distribution. Diffuser dimensions and adjustments should therefore be coordinated with the ventilation system.
Before installation, determine how the linear diffuser will connect to the ductwork. A suitable PLDD plenum box may be used. Verify diffuser length, slot count, box dimensions and round duct connection diameter.
Linear slot diffusers are commonly used in ceiling installations where a long, clean air distribution line is desired. The design must allow sufficient space for the diffuser and plenum box, together with access for adjustment and maintenance.
Linear slot diffusers feature an elongated design and distribute air through one or more narrow openings. They are often chosen for their linear ceiling appearance and specific airflow distribution characteristics.
Round air diffusers are commonly connected directly to round ducts and may provide a simpler solution where a linear opening is not required.
The final choice should be based on design airflow, pressure loss, noise, mounting construction and the desired air distribution pattern.
It is an elongated ventilation component with one or more narrow airflow slots, designed to supply air to a room or extract air from it.
These terms are often used for the same type of product. PLD is a series of linear slot air diffusers.
Yes. The manufacturer specifies that PLD diffusers can be used in both airflow directions.
PLD models are available with one, two, three or four slots.
The actual lengths of the listed PLD models are 490 and 985 mm.
Yes. Each slot has a damper for adjusting airflow.
Yes. The product specifications state that the series is suitable for both.
They are made from aluminium with a white RAL9016 powder-coated finish.
It connects a linear slot diffuser to the duct system. The box must be selected according to the diffuser model, length and required round duct diameter.
Yes. The manufacturer offers acoustic insulation by special order.
Yes. They are used in ceiling air distribution systems, subject to suitable installation drawings and the ventilation design.
Yes, provided that airflow, pressure loss and connection characteristics match the heat recovery system design.
Linear diffusers can be arranged alongside each other in a design, but the possibility of mechanically joining specific PLD models and finishing their joints must be checked against the construction details.
Noise depends on airflow, velocity, damper position and pressure loss. PLD technical documentation includes noise performance information.
Visible surfaces should be cleaned periodically using a soft cloth and products suitable for powder-coated surfaces. Damper maintenance should follow the manufacturer's instructions.
Yes. el-vent.com delivers worldwide. Shipping availability, costs and delivery times depend on the destination and order details.
The el-vent.com catalogue features the aluminium PLD linear slot diffuser series with one-, two-, three- and four-slot models. They are designed for supply and extract ventilation and for distributing warm or cold air. Compatible PLDD plenum boxes can be used for connection to ductwork.
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