Description

The straight ventilation box (in-line plenum box) with a single outlet is engineered for modern supply and exhaust MVHR units (mechanical ventilation with heat recovery). The main design feature of this model is the linear (straight) arrangement of the connection spigots. The inlet for the flexible air duct and the outlet for the room diffuser are located on the exact same axis. This solves installation challenges in non-standard niches or tight ceiling voids where bending the duct at a 90-degree angle is impossible, ensuring an unobstructed, quiet airflow without turbulence.

The body of the product is manufactured from galvanized sheet steel. This material is highly resistant to corrosion, which is vital for concealed installation in high-humidity areas such as kitchens, showers, and bathrooms. The high rigidity of the metal prevents the adapter from deforming when cast in concrete floors or secured tightly within suspended ceiling frameworks, ensuring high system airtightness throughout the building lifespan.

Spigot Modifications

To optimize installation processes for various construction needs, the straight plenum box is available with three types of flexible duct connections:

• OC Modification (Standard): The classic all-metal version featuring galvanized steel spigots. It requires sealing the joints with sealing tape or sealant. This is an economical and practical choice for projects utilizing standard assembly techniques.
• GM Modification (With Rubber Gasket): The metal spigots are equipped with factory-fitted ring seals made of durable EPDM rubber. This ensures a quick and convenient connection of the flexible duct, guaranteeing the highest airtightness class without the hassle of using mastics or tapes.
• PK Modification (Plastic Spigots): A technological solution designed for maximum installation speed. The spigots are made of high-strength structural plastic with integrated snap-locks. The flexible duct is simply inserted until it clicks, after which the built-in clips firmly lock the pipe in place, preventing accidental disconnection during subsequent construction works.

Advantages

• In-Line Design: The coaxial arrangement of the inlet and outlet allows routing the ventilation ducts in a straight line. This saves space during concealed installation and completely eliminates the need to bend the ventilation pipes at the terminal point.
• Versatility of Application: The design works equally effectively for both fresh air supply and stale air exhaust. Installation is permitted in any plane — ceiling, wall, or concealed within the floor.
• Energy-Efficient Aerodynamics: The straight airflow path minimizes aerodynamic resistance. This removes extra load from the MVHR unit and optimizes overall power consumption, while making the airflow virtually imperceptible to residents.
• Convenient Mounting: Cleverly designed external mounting tabs allow for quick balancing and securing of the box to building structures using standard wall plugs and perforated tape.

Technical Specifications

• Component Type: 1-outlet straight plenum box (in-line diffuser adapter)
• Housing Material: Galvanized steel
• Number of Connected Channels: 1 outlet for flexible ducting
• Compatible Duct Types: Flexible air ducts with a diameter of 75 mm
• Diffuser Connection Diameter: 125 mm

Overall Dimensions (L x W x H)

Dimensions (excluding the length of the long pipe section L=330 mm):

• OC (Galvanized): 161 x 152 x 101 mm (1x75/125P)
• PK (Plastic): 161 x 152 x 101 mm (1x75/125P)
• GM (Rubber-gasketed): 161 x 152 x 101 mm (1x75/125P)