| Collectors PK
Galvanized Manifolds PK (with Polymer Connectors)
Purpose and Hybrid Construction
A manifold with polymer connectors (PK series) is a hybrid distribution hub for radial heat recovery ventilation systems. Its purpose is to take the main airflow from the heat recovery unit and distribute it into individual branches of flexible ducts.
In contrast to the classic all-metal OC series manifolds, the key feature of this series is its hybrid design: a robust galvanized steel body is combined with high-tech polymer spigots. The steel body guarantees strength, while the polymer connectors provide exceptional hygiene and maximum installation speed.
Advantages of the Hybrid Design
The combination of steel and polymer with mechanical locking provides key advantages for a modern ventilation system:
- Guaranteed Airtightness (Class D): The snap-fit system on the polymer spigots, along with an EPDM gasket, ensures an instantaneous and completely airtight Class D connection, fully eliminating human error.
- Maximum Hygiene (VOC-Free): "Dry" installation without glue or silicone completely eliminates the emission of Volatile Organic Compounds (VOCs). These harmful chemicals, found in many construction sealants, are a primary source of indoor air pollution and can negatively affect health. Our system is free from them. Furthermore, the smooth antistatic surface of the polymer spigots inhibits dust accumulation.
- High Installation Speed: Connecting the flexible ducts is done in a single motion until a "click" is heard, which significantly reduces time and labor costs on-site compared to traditional methods.
- Strength and Reliability: The galvanized steel core of the body provides the structural rigidity needed for secure mounting and long-term durability, including for installation in a floor screed.
Explanation of Airtightness Classes (EN 12237 standard)
The airtightness class is a key indicator that defines the quality of the entire ductwork system. It specifies the volume of air lost due to leaks in the connections. The standard establishes four main classes:
- Class A: A basic level with high permissible leakage. It is not used in modern energy-efficient buildings.
- Class B: An improved class, formerly the standard for general ventilation. It is insufficient for heat recovery systems due to significant losses.
- Class C: A high class of airtightness. It is considered the mandatory minimum for quality ventilation systems aiming to meet energy efficiency standards.
- Class D: The highest possible class, with maximum airtightness. Air leakage is practically reduced to zero. This is the "gold standard" for passive and nearly zero-energy buildings (NZEB), guaranteeing that no energy spent on air treatment is wasted.
Comparison of Radial and Trunk-and-Branch Ventilation Systems
| Characteristic |
Radial System (with Manifold) |
Traditional Trunk-and-Branch System |
| Airtightness |
High (Class D). Minimal connections, factory gaskets on the manifold. |
Depends on the installer. Numerous tees, branches, and joints create a high risk of leaks. |
| Hygiene |
High. No cross-contamination between rooms. |
Low. A common main duct can transfer odors, dust, and microorganisms between rooms. |
| Acoustics |
High. No "crosstalk" noise (conversations are not transmitted through the ventilation). |
Low. Noise from one room is easily transferred to another through the common duct. |
| Balancing |
Simple and precise. Each branch is adjusted individually at its endpoint. |
Complex and imprecise. Adjusting one point affects the entire trunk line. |
| Installation Speed |
High. Laying continuous flexible ducts from one point to another. |
Low. Requires assembly of many short sections, tees, and branches. |
| Serviceability and Upgrades |
Simple. Each branch is independent and can be serviced or replaced without affecting the others. |
Complex. Any intervention requires cutting into the main trunk line, disrupting the balance of the entire system. |
Manifold Types and Selection
Manifolds vary by the number of spigots for connecting flexible ducts and by the installation method. The correct choice depends on the scale of the ventilation system and the building's construction.
1. By Number of Outlets
The main parameter is the number of outgoing spigots (usually for ø75 or ø90 mm ducts). It must correspond to the number of branches in your system. Manifolds are available with 6, 10, 12, 15, or more outlets. It is always a good practice to have a small reserve when designing the system.
2. By Installation Type
- For Floor Installation: Flat and low-profile models that are convenient to place in the insulation layer or to cast into the floor screed.
- For Ceiling/Wall Installation: Compact models that are easy to mount under the ceiling or on a wall, taking up minimal space.
PK Manifold Selection Criteria
When choosing a hybrid distribution manifold, pay attention to:
- Guaranteed Class D Airtightness: Ensure the locking system and gaskets are certified.
- Polymer Quality: Prefer virgin HDPE with hygiene certificates.
- Steel Body Strength: The galvanized steel body must be rigid enough to prevent deformation during installation.
- Gasket Quality: The main spigot must be equipped with a reliable EPDM gasket.
Main Installation Steps
Proper installation of the hybrid manifold ensures the airtightness and correct operation of the entire radial system.
- Connecting the Main Duct: The spiral-wound duct from the heat recovery unit is securely connected to the main spigot of the manifold.
- Securing the Body: The manifold is firmly fixed to the sub-floor, wall, or ceiling structure to avoid vibrations and noise.
- Connecting the Flexible Ducts: Each duct is inserted into a polymer spigot until the locking mechanism clicks. The connection is now complete—fast and 100% airtight.
Ventilation System Design and Installation
The correct selection of components is fundamental to creating an effective system. Our engineers provide design and calculations, while our in-house installers ensure the professional installation of all elements to guarantee airtightness, efficiency, and quiet operation.
CE Certification and Compliance
All system components supplied by Akvilon are CE marked, confirming their full compliance with EU regulations, including the Ecodesign Directive (ErP) and the EN 12237 standard for airtightness.
Need Help with Your System?
Our engineers are ready to help you calculate and specify the right ductwork system for your project. You can also purchase all the necessary components in our online store.
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