| Collectors GM
Galvanized Manifolds GM (with Rubber Seals)
Purpose and Technology
A GM series manifold is a professional distribution hub for radial heat recovery ventilation systems. Its purpose is to take the main airflow from the heat recovery unit and evenly distribute it into individual branches of flexible ducts.
The key feature of the GM series is its classic galvanized steel construction with factory-installed EPDM rubber seals on the spigots. This time-tested technology provides guaranteed Class D airtightness and maximum connection reliability. For projects where installation speed via a "click-system" is a priority, consider our hybrid PK series.
Advantages of Manifolds with EPDM Seals
GM series manifolds are the choice of professionals due to a combination of reliability, durability, and guaranteed performance characteristics.
- Guaranteed Airtightness (Class D): The factory installation of double EPDM seals on each spigot eliminates the risk of errors from manual sealing. This guarantees no air leaks, minimizes heat loss, and ensures the ventilation unit operates with minimal energy consumption (low SFP).
- Durability and Serviceability: Galvanized steel and high-quality EPDM rubber are materials with a service life proven over decades. The modular design allows for system maintenance and, if necessary, seal replacement, ensuring a low total cost of ownership in the long run.
- Strength and Fire Safety: The all-metal steel body possesses high structural rigidity required for any type of installation and is a non-combustible material, ensuring compliance with strict fire safety regulations.
- Hygiene: The smooth metal surface is hygienic and easy to clean, which is important for maintaining high indoor air quality throughout the entire operational life.
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. |
GM Manifold Selection Criteria
When choosing a manifold with rubber seals, pay attention to:
- Certified Airtightness Class (D): Ensure the manufacturer guarantees compliance with Class D.
- EPDM Gasket Quality: The seals should be elastic, have a double lip, and be securely fixed on the spigots.
- Steel Body Strength: A body made of sufficiently thick galvanized steel ensures the manifold will not deform during installation.
- Low Hydraulic Resistance: An aerodynamically sound design is important for maintaining low system energy consumption.
Main Installation Steps
Proper installation of a GM series manifold ensures the airtightness and reliability of the entire system.
- Connecting the Main Duct: The spiral-wound duct is securely connected to the main spigot of the manifold, which is equipped with an EPDM seal.
- Securing the Body: The manifold is firmly fixed to the sub-floor, wall, or ceiling structure.
- Connecting the Flexible Ducts: Each flexible duct is pushed firmly into an outlet spigot. The compression force of the EPDM seal ensures a 100% airtight connection.
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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